diff --git a/classes/Address.php b/classes/Address.php
index ad5cc7def..1992e7102 100644
--- a/classes/Address.php
+++ b/classes/Address.php
@@ -278,9 +278,12 @@ class AddressCore extends ObjectModel
 	{
 		if (isset(self::$_idCountries[$id_address]))
 			return self::$_idCountries[$id_address];
-		$result = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
-		SELECT `id_country`, `id_state`, `vat_number`, `postcode` FROM `'._DB_PREFIX_.'address`
-		WHERE `id_address` = '.(int)$id_address);
+		if ($id_address)
+			$result = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
+			SELECT `id_country`, `id_state`, `vat_number`, `postcode` FROM `'._DB_PREFIX_.'address`
+			WHERE `id_address` = '.(int)$id_address);
+		else
+			$result = false;
 		self::$_idCountries[$id_address] = $result;
 		return $result;
 	}
diff --git a/classes/Configuration.php b/classes/Configuration.php
index d529d40f1..013ee482f 100644
--- a/classes/Configuration.php
+++ b/classes/Configuration.php
@@ -93,9 +93,9 @@ class ConfigurationCore extends ObjectModel
 	 */
 	public static function getIdByName($key, $id_shop_group = null, $id_shop = null)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Shop::getContextShopID();
-		if (is_null($id_shop_group))
+		if ($id_shop_group === null)
 			$id_shop_group = Shop::getContextShopGroupID();
 
 		$sql = 'SELECT id_configuration
@@ -147,9 +147,9 @@ class ConfigurationCore extends ObjectModel
 	public static function get($key, $id_lang = null, $id_shop_group = null, $id_shop = null)
 	{
 		$id_lang = (int)$id_lang;
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Shop::getContextShopID();
-		if (is_null($id_shop_group))
+		if ($id_shop_group === null)
 			$id_shop_group = Shop::getContextShopGroupID();
 
 		if (!isset(self::$_CONF[$id_lang]))
@@ -203,9 +203,9 @@ class ConfigurationCore extends ObjectModel
 	 		throw new PrestaShopException('keys var is not an array');
 
 		$id_lang = (int)$id_lang;
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Shop::getContextShopID();
-		if (is_null($id_shop_group))
+		if ($id_shop_group === null)
 			$id_shop_group = Shop::getContextShopGroupID();
 
 	 	$results = array();
@@ -246,9 +246,9 @@ class ConfigurationCore extends ObjectModel
 		if (!Validate::isConfigName($key))
 			die(Tools::displayError());
 
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Shop::getContextShopID();
-		if (is_null($id_shop_group))
+		if ($id_shop_group === null)
 			$id_shop_group = Shop::getContextShopGroupID();
 
 		if (!is_array($values))
@@ -293,9 +293,9 @@ class ConfigurationCore extends ObjectModel
 		if (!Validate::isConfigName($key))
 			die(Tools::displayError());
 
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Shop::getContextShopID();
-		if (is_null($id_shop_group))
+		if ($id_shop_group === null)
 			$id_shop_group = Shop::getContextShopGroupID();
 
 		if (!is_array($values))
diff --git a/classes/Customer.php b/classes/Customer.php
index e734aa09e..35b01fa47 100644
--- a/classes/Customer.php
+++ b/classes/Customer.php
@@ -531,7 +531,7 @@ class CustomerCore extends ObjectModel
 
 	public static function getGroupsStatic($id_customer)
 	{
-		if (!Group::isFeatureActive())
+		if (!Group::isFeatureActive() || $id_customer = 0)
 			return array(Configuration::get('PS_CUSTOMER_GROUP'));
 
 		if (!isset(self::$_customer_groups[$id_customer]))
diff --git a/classes/Media.php b/classes/Media.php
index 220157fd9..c6477450e 100755
--- a/classes/Media.php
+++ b/classes/Media.php
@@ -209,7 +209,7 @@ class MediaCore
 	 */
 	public static function getJSPath($js_uri)
 	{
-		if (is_array($js_uri) || is_null($js_uri) || empty($js_uri))
+		if (is_array($js_uri) || $js_uri === null || empty($js_uri))
 			return false;
 		$url_data = parse_url($js_uri);
 		if (!array_key_exists('host', $url_data))
@@ -258,14 +258,14 @@ class MediaCore
 	public static function getJqueryPath($version = null, $folder = null, $minifier = true)
 	{
 		$add_no_conflict = false;
-		if (is_null($version))
+		if ($version === null)
 			$version = _PS_JQUERY_VERSION_; //set default version
 		else if (preg_match('/^([0-9]+\.)+[0-9]$/Ui', $version))
 			$add_no_conflict = true;
 		else
 			return false;
 
-		if (is_null($folder))
+		if ($folder === null)
 			$folder = _PS_JS_DIR_.'jquery/'; //set default folder
 		//check if file exist
 		$file = $folder.'jquery-'.$version.($minifier ? '.min.js' : '.js');
@@ -345,7 +345,7 @@ class MediaCore
 	public static function getJqueryPluginPath($name, $folder)
 	{
 		$plugin_path = array('js' => array(), 'css' => array());
-		if (is_null($folder))
+		if ($folder === null)
 			$folder = _PS_JS_DIR_.'jquery/plugins/'; //set default folder
 
 		$file = 'jquery.'.$name.'.js';
diff --git a/classes/ObjectModel.php b/classes/ObjectModel.php
index edd54eb1b..8f89447ea 100644
--- a/classes/ObjectModel.php
+++ b/classes/ObjectModel.php
@@ -166,7 +166,7 @@ abstract class ObjectModelCore
 		$this->def = self::getDefinition($this);
 		$this->setDefinitionRetrocompatibility();
 
-		if (!is_null($id_lang))
+		if ($id_lang !== null)
 			$this->id_lang = (Language::getLanguage($id_lang) !== false) ? $id_lang : Configuration::get('PS_LANG_DEFAULT');
 
 		if ($id_shop && $this->isMultishop())
@@ -299,7 +299,7 @@ abstract class ObjectModelCore
 		$is_lang_multishop = $this->isLangMultishop();
 
 		$fields = array();
-		if (is_null($this->id_lang))
+		if ($this->id_lang === null)
 			foreach (Language::getLanguages(false) as $language)
 			{
 				$fields[$language['id_lang']] = $this->formatFields(self::FORMAT_LANG, $language['id_lang']);
@@ -943,7 +943,7 @@ abstract class ObjectModelCore
 			),
 		);
 
-		if (is_null($ws_params_attribute_name))
+		if ($ws_params_attribute_name === null)
 			$ws_params_attribute_name = 'webserviceParameters';
 
 		if (!isset($this->{$ws_params_attribute_name}['objectNodeName']))
@@ -1068,7 +1068,7 @@ abstract class ObjectModelCore
 	 */
 	public function isAssociatedToShop($id_shop = null)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Context::getContext()->shop->id;
 
 		$sql = 'SELECT id_shop
diff --git a/classes/Tools.php b/classes/Tools.php
index 0aa110639..cadda0887 100644
--- a/classes/Tools.php
+++ b/classes/Tools.php
@@ -963,8 +963,7 @@ class ToolsCore
 		// Remove all non-whitelist chars.
 		$str = preg_replace('/[^a-zA-Z0-9\s\'\:\/\[\]-\pL]/u', '', $str);
 		$str = preg_replace('/[\s\'\:\/\[\]-]+/', ' ', $str);
-		$str = preg_replace('/[ ]/', '-', $str);
-		$str = preg_replace('/[\/]/', '-', $str);
+		$str = str_replace(array(' ', '/'), '-', $str);
 
 		// If it was not possible to lowercase the string with mb_strtolower, we do it after the transformations.
 		// This way we lose fewer special chars.
diff --git a/classes/Validate.php b/classes/Validate.php
index fb3946bec..049be4ef6 100644
--- a/classes/Validate.php
+++ b/classes/Validate.php
@@ -490,7 +490,7 @@ class ValidateCore
 	 */
 	public static function isBool($bool)
 	{
-		return is_null($bool) || is_bool($bool) || preg_match('/^0|1$/', $bool);
+		return $bool === null || is_bool($bool) || preg_match('/^0|1$/', $bool);
 	}
 
 	/**
@@ -655,7 +655,7 @@ class ValidateCore
 
 	public static function isNullOrUnsignedId($id)
 	{
-		return is_null($id) || Validate::isUnsignedId($id);
+		return $id === null || Validate::isUnsignedId($id);
 	}
 
 	/**
@@ -803,7 +803,7 @@ class ValidateCore
 	 */
 	public static function isSortDirection($value)
 	{
-		return (!is_null($value) && ($value === 'ASC' || $value === 'DESC'));
+		return ($value !== null && ($value === 'ASC' || $value === 'DESC'));
 	}
 
 	/**
@@ -909,7 +909,7 @@ class ValidateCore
 	 */
 	public static function isSerializedArray($data)
 	{
-		return is_null($data) || (is_string($data) && preg_match('/^a:[0-9]+:{.*;}$/s', $data));
+		return $data === null || (is_string($data) && preg_match('/^a:[0-9]+:{.*;}$/s', $data));
 	}
 
 	/**
@@ -920,7 +920,7 @@ class ValidateCore
 	 */
 	public static function isCoordinate($data)
 	{
-		return is_null($data) || preg_match('/^\-?[0-9]{1,8}\.[0-9]{1,8}$/s', $data);
+		return $data === null || preg_match('/^\-?[0-9]{1,8}\.[0-9]{1,8}$/s', $data);
 	}
 
 	/**
diff --git a/classes/controller/FrontController.php b/classes/controller/FrontController.php
index 67ab39a8a..17f5fb7f6 100755
--- a/classes/controller/FrontController.php
+++ b/classes/controller/FrontController.php
@@ -841,7 +841,7 @@ class FrontControllerCore extends Controller
 			return array();
 
 		$context = Context::getContext();
-		if (!isset($context->customer))
+		if (!isset($context->customer) || !$context->customer->id)
 			return array();
 
 		if (!is_array(self::$currentCustomerGroups))
diff --git a/classes/db/DbQuery.php b/classes/db/DbQuery.php
index 0e0c81b8e..53fa8ea99 100644
--- a/classes/db/DbQuery.php
+++ b/classes/db/DbQuery.php
@@ -96,7 +96,7 @@ class DbQueryCore
 	 */
 	public function leftJoin($table, $alias = null, $on = null)
 	{
-		return $this->join('LEFT JOIN `'._DB_PREFIX_.bqSQL($table).'`'.($alias ? ' '.pSQL($alias) : '').($on ? ' ON '.$on : ''));
+		return $this->join('LEFT JOIN `'._DB_PREFIX_.bqSQL($table).'`'.($alias ? ' `'.pSQL($alias).'`' : '').($on ? ' ON '.$on : ''));
 	}
 
 	/**
diff --git a/classes/module/Module.php b/classes/module/Module.php
index f92739506..72822c945 100644
--- a/classes/module/Module.php
+++ b/classes/module/Module.php
@@ -1430,7 +1430,7 @@ abstract class ModuleCore
 	protected static $exceptionsCache = null;
 	public function getExceptions($hookID, $dispatch = false)
 	{
-		if (is_null(self::$exceptionsCache))
+		if (self::$exceptionsCache === null)
 		{
 			self::$exceptionsCache = array();
 			$sql = 'SELECT * FROM `'._DB_PREFIX_.'hook_module_exceptions`
@@ -1557,7 +1557,7 @@ abstract class ModuleCore
 	public function getTemplatePath($template)
 	{
 		$overloaded = $this->_isTemplateOverloaded($template);
-		if (is_null($overloaded))
+		if ($overloaded === null)
 			return null;
 		if ($overloaded)
 			return _PS_THEME_DIR_.'modules/'.$this->name.'/'.$template;
diff --git a/classes/stock/StockAvailable.php b/classes/stock/StockAvailable.php
index 16ae94ec3..46b9a6598 100644
--- a/classes/stock/StockAvailable.php
+++ b/classes/stock/StockAvailable.php
@@ -100,7 +100,7 @@ class StockAvailableCore extends ObjectModel
 		$query->from('stock_available');
 		$query->where('id_product = '.(int)$id_product);
 
-		if (!is_null($id_product_attribute))
+		if ($id_product_attribute !== null)
 			$query->where('id_product_attribute = '.(int)$id_product_attribute);
 
 		$query = StockAvailable::addSqlShopRestriction($query, $id_shop);
@@ -219,7 +219,7 @@ class StockAvailableCore extends ObjectModel
 	 */
 	public static function setProductDependsOnStock($id_product, $depends_on_stock = true, $id_shop = null, $id_product_attribute = 0)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Context::getContext()->shop->id;
 
 		$existing_id = StockAvailable::getStockAvailableIdByProductId((int)$id_product, (int)$id_product_attribute, (int)$id_shop);
@@ -257,7 +257,7 @@ class StockAvailableCore extends ObjectModel
 	 */
 	public static function setProductOutOfStock($id_product, $out_of_stock = false, $id_shop = null, $id_product_attribute = 0)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Context::getContext()->shop->id;
 
 		$existing_id = StockAvailable::getStockAvailableIdByProductId((int)$id_product, (int)$id_product_attribute, (int)$id_shop);
@@ -295,11 +295,11 @@ class StockAvailableCore extends ObjectModel
 	 */
 	public static function getQuantityAvailableByProduct($id_product = null, $id_product_attribute = null, $id_shop = null)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Context::getContext()->shop->id;
 
 		// if null, it's a product without attributes
-		if (is_null($id_product_attribute))
+		if ($id_product_attribute === null)
 			$id_product_attribute = 0;
 
 		$query = new DbQuery();
@@ -307,7 +307,7 @@ class StockAvailableCore extends ObjectModel
 		$query->from('stock_available');
 
 		// if null, it's a product without attributes
-		if (!is_null($id_product))
+		if ($id_product !== null)
 			$query->where('id_product = '.(int)$id_product);
 
 		$query->where('id_product_attribute = '.(int)$id_product_attribute);
@@ -415,7 +415,7 @@ class StockAvailableCore extends ObjectModel
 		$context = Context::getContext();
 
 		// if there is no $id_shop, gets the context one
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = (int)$context->shop->id;
 
 		$depends_on_stock = StockAvailable::dependsOnStock($id_product);
@@ -529,7 +529,7 @@ class StockAvailableCore extends ObjectModel
 	 */
 	public static function dependsOnStock($id_product, $id_shop = null)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Context::getContext()->shop->id;
 
 		$query = new DbQuery();
@@ -552,7 +552,7 @@ class StockAvailableCore extends ObjectModel
 	 */
 	public static function outOfStock($id_product, $id_shop = null)
 	{
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = Context::getContext()->shop->id;
 
 		$query = new DbQuery();
@@ -583,7 +583,7 @@ class StockAvailableCore extends ObjectModel
 			$alias .= '.';
 
 		// if there is no $id_shop, gets the context one
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = $context->shop->id;
 
 		// if we are in $shop_group context
@@ -636,7 +636,7 @@ class StockAvailableCore extends ObjectModel
 		$group_ok = false;
 
 		// if there is no $id_shop, gets the context one
-		if (is_null($id_shop))
+		if ($id_shop === null)
 			$id_shop = $context->shop->id;
 
 		$shop_group = new ShopGroup((int)Shop::getContextShopGroupID());
diff --git a/config/smartyfront.config.inc.php b/config/smartyfront.config.inc.php
index c2f8f9e9d..8426ec0be 100644
--- a/config/smartyfront.config.inc.php
+++ b/config/smartyfront.config.inc.php
@@ -45,23 +45,23 @@ function smartyTranslate($params, &$smarty)
 	if (isset($smarty->source) && (strpos($smarty->source->filepath, DIRECTORY_SEPARATOR.'override'.DIRECTORY_SEPARATOR) !== false))
 		$key = 'override_'.$key;
 
-	$lang_array = $_LANG;
 	if ($params['mod'])
 		return Translate::getModuleTranslation($params['mod'], $params['s'], $basename, $params['sprintf']);
 	else if ($params['pdf'])
 		return Translate::getPdfTranslation($params['s']);
 
-	if ($lang_array != null && isset($lang_array[$key]))
-		$msg = $lang_array[$key];
-	elseif ($lang_array != null && isset($lang_array[Tools::strtolower($key)]))
-		$msg = $lang_array[Tools::strtolower($key)];
+	if ($_LANG != null && isset($_LANG[$key]))
+		$msg = $_LANG[$key];
+	elseif ($_LANG != null && isset($_LANG[Tools::strtolower($key)]))
+		$msg = $_LANG[Tools::strtolower($key)];
 	else
 		$msg = $params['s'];
 
 	if ($msg != $params['s'])
 		$msg = $params['js'] ? addslashes($msg) : stripslashes($msg);
 
-	$msg = Translate::checkAndReplaceArgs($msg, $params['sprintf']);
+	if ($params['sprintf'] !== null)
+		$msg = Translate::checkAndReplaceArgs($msg, $params['sprintf']);
 
 	return $params['js'] ? $msg : Tools::htmlentitiesUTF8($msg);
 }
diff --git a/modules/blockreinsurance/blockreinsurance.php b/modules/blockreinsurance/blockreinsurance.php
index ff0da4f84..6c98d74bb 100644
--- a/modules/blockreinsurance/blockreinsurance.php
+++ b/modules/blockreinsurance/blockreinsurance.php
@@ -45,49 +45,6 @@ class Blockreinsurance extends Module
 
 		$this->displayName = $this->l('Bloc reinsurance');
 		$this->description = $this->l('Add a block to display more infos to reassure your customers');
-
-		$this->fields_list = array(
-			'id_reinsurance' => array(
-				'title' => $this->l('Id'),
-				'width' => 120,
-				'type' => 'text',
-			),
-			'text' => array(
-				'title' => $this->l('Text'),
-				'width' => 140,
-				'type' => 'text',
-				'filter_key' => 'a!lastname'
-			),
-		);
-
-		if (Shop::isFeatureActive())
-			$this->fields_list['id_shop'] = array('title' => $this->l('ID Shop'), 'align' => 'center', 'width' => 25, 'type' => 'int');
-
-		$this->fields_form[0]['form'] = array(
-			'legend' => array(
-				'title' => $this->l('Reinsurance new block'),
-			),
-			'input' => array(
-				array(
-					'type' => 'file',
-					'label' => $this->l('Image:'),
-					'name' => 'image',
-					'value' => true
-				),
-				array(
-					'type' => 'textarea',
-					'label' => $this->l('Text:'),
-					'lang' => true,
-					'name' => 'text',
-					'cols' => 40,
-					'rows' => 10
-				)
-			),
-			'submit' => array(
-				'title' => $this->l('   Save   '),
-				'class' => 'button'
-			)
-		);
 	}
 
 	public function install()
@@ -254,6 +211,32 @@ class Blockreinsurance extends Module
 	{
 		$default_lang = (int)Configuration::get('PS_LANG_DEFAULT');
 
+		$this->fields_form[0]['form'] = array(
+			'legend' => array(
+				'title' => $this->l('Reinsurance new block'),
+			),
+			'input' => array(
+				array(
+					'type' => 'file',
+					'label' => $this->l('Image:'),
+					'name' => 'image',
+					'value' => true
+				),
+				array(
+					'type' => 'textarea',
+					'label' => $this->l('Text:'),
+					'lang' => true,
+					'name' => 'text',
+					'cols' => 40,
+					'rows' => 10
+				)
+			),
+			'submit' => array(
+				'title' => $this->l('   Save   '),
+				'class' => 'button'
+			)
+		);
+
 		$helper = new HelperForm();
 		$helper->module = $this;
 		$helper->name_controller = 'blockreinsurance';
@@ -290,6 +273,23 @@ class Blockreinsurance extends Module
 
 	protected function initList()
 	{
+		$this->fields_list = array(
+			'id_reinsurance' => array(
+				'title' => $this->l('Id'),
+				'width' => 120,
+				'type' => 'text',
+			),
+			'text' => array(
+				'title' => $this->l('Text'),
+				'width' => 140,
+				'type' => 'text',
+				'filter_key' => 'a!lastname'
+			),
+		);
+
+		if (Shop::isFeatureActive())
+			$this->fields_list['id_shop'] = array('title' => $this->l('ID Shop'), 'align' => 'center', 'width' => 25, 'type' => 'int');
+
 		$helper = new HelperList();
 		$helper->shopLinkType = '';
 		$helper->simple_header = true;
diff --git a/modules/favoriteproducts/FavoriteProduct.php b/modules/favoriteproducts/FavoriteProduct.php
index 4b5b80dfb..830b550d0 100644
--- a/modules/favoriteproducts/FavoriteProduct.php
+++ b/modules/favoriteproducts/FavoriteProduct.php
@@ -96,6 +96,9 @@ class FavoriteProduct extends ObjectModel
 
 	public static function isCustomerFavoriteProduct($id_customer, $id_product, Shop $shop = null)
 	{
+		if (!$id_customer)
+			return false;
+
 		if (!$shop)
 			$shop = Context::getContext()->shop;