diff --git a/classes/Product.php b/classes/Product.php
index e9c9eda2a..28da3c03a 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -1957,7 +1957,7 @@ class ProductCore extends ObjectModel
 	*/
 	public function getPrice($tax = true, $id_product_attribute = NULL, $decimals = 6, $divisor = NULL, $only_reduc = false, $usereduc = true, $quantity = 1)
 	{
-		return self::getPriceStatic((int)($this->id), $tax, $id_product_attribute, $decimals, $divisor, $only_reduc, $usereduc, $quantity);
+		return Product::getPriceStatic((int)($this->id), $tax, $id_product_attribute, $decimals, $divisor, $only_reduc, $usereduc, $quantity);
 	}
 
 	public function getIdProductAttributeMostExpensive()
@@ -1975,7 +1975,7 @@ class ProductCore extends ObjectModel
 
 	public function getPriceWithoutReduct($notax = false, $id_product_attribute = false)
 	{
-		return self::getPriceStatic((int)($this->id), !$notax, $id_product_attribute, 6, NULL, false, false);
+		return Product::getPriceStatic((int)($this->id), !$notax, $id_product_attribute, 6, NULL, false, false);
 	}
 
 	/**
diff --git a/install-dev/classes/ToolsInstall.php b/install-dev/classes/ToolsInstall.php
index 389ed74d1..f75a71604 100644
--- a/install-dev/classes/ToolsInstall.php
+++ b/install-dev/classes/ToolsInstall.php
@@ -66,7 +66,7 @@ class ToolsInstall
 				!isset($_GET['name']) OR empty($_GET['name']) OR !Validate::isUnixName($_GET['name']),
 				!isset($_GET['login']) OR empty($_GET['login']) OR !Validate::isUnixName($_GET['login']),
 				!isset($_GET['password']),
-				!isset($_GET['tablePrefix']) OR !Validate::isTablePrefix($_GET['tablePrefix']),
+				(!isset($_GET['tablePrefix']) OR !Validate::isTablePrefix($_GET['tablePrefix'])) && !empty($_GET['tablePrefix']),
 			);
 
 			foreach ($data_check AS $data)
diff --git a/install-dev/controller.js b/install-dev/controller.js
index 69dab95a9..6ba94a371 100644
--- a/install-dev/controller.js
+++ b/install-dev/controller.js
@@ -372,7 +372,7 @@ function verifyDbAccess ()
 			+"&password="+encodeURIComponent($("#dbPassword").val())
 			+"&engine="+$("#dbEngine option:selected").val()
 			+ "&name=" + $("#dbName").val()
-			+ "&tablePrefix=" + $("#db_prefix").val(),
+			+ "&tablePrefix=" + encodeURIComponent($("#db_prefix").val()),
 		success: function(ret)
 		{
 			ret = ret.getElementsByTagName('action')[0];
diff --git a/modules/blocklayered/blocklayered.php b/modules/blocklayered/blocklayered.php
index 72d8e81e6..a843fe1e3 100644
--- a/modules/blocklayered/blocklayered.php
+++ b/modules/blocklayered/blocklayered.php
@@ -49,15 +49,14 @@ class BlockLayered extends Module
 	
 	public function install()
 	{
-		if ($this->registerHook('leftColumn') && $this->registerHook('header') && $this->registerHook('footer')
+		if (parent::install() && $this->registerHook('leftColumn') && $this->registerHook('header') && $this->registerHook('footer')
 		&& $this->registerHook('categoryAddition') && $this->registerHook('categoryUpdate') && $this->registerHook('attributeGroupForm')
 		&& $this->registerHook('afterSaveAttributeGroup') && $this->registerHook('afterDeleteAttributeGroup') && $this->registerHook('featureForm')
 		&& $this->registerHook('afterDeleteFeature') && $this->registerHook('afterSaveFeature') && $this->registerHook('categoryDeletion')
 		&& $this->registerHook('afterSaveProduct') && $this->registerHook('productListAssign') && $this->registerHook('postProcessAttributeGroup')
 		&& $this->registerHook('postProcessFeature') && $this->registerHook('featureValueForm') && $this->registerHook('postProcessFeatureValue')
 		&& $this->registerHook('afterDeleteFeatureValue') && $this->registerHook('afterSaveFeatureValue') && $this->registerHook('attributeForm')
-		&& $this->registerHook('postProcessAttribute') && $this->registerHook('afterDeleteAttribute') && $this->registerHook('afterSaveAttribute')
-		&& parent::install())
+		&& $this->registerHook('postProcessAttribute') && $this->registerHook('afterDeleteAttribute') && $this->registerHook('afterSaveAttribute'))
 		{
 			Configuration::updateValue('PS_LAYERED_HIDE_0_VALUES', 0);
 			Configuration::updateValue('PS_LAYERED_SHOW_QTIES', 1);
@@ -65,24 +64,32 @@ class BlockLayered extends Module
 			$this->rebuildLayeredStructure();
 			$this->rebuildLayeredCache();
 		self::_installPriceIndexTable();
-		self::_installFriendlyUrlTable();
-		self::_installIndexableAttributeTable();
-			self::_installProductAttributeTable();
+			$this->_installFriendlyUrlTable();
+			$this->_installIndexableAttributeTable();
+			$this->_installProductAttributeTable();
 
 		$this->indexUrl();
 			$this->indexAttribute();
+			
+			if(Db::getInstance()->getValue('SELECT count(*) FROM `'._DB_PREFIX_.'product`') < 10000) // Lock price indexation if too many products
 		self::fullIndexProcess();
 
 			return true;
 	}
+		else
+		{
+			// Installation failed (or hook registration) => uninstall the module
+			$this->uninstall();
 		return false;
 	}
+	}
 
 	public function uninstall()
 	{
 		/* Delete all configurations */
 		Configuration::deleteByName('PS_LAYERED_HIDE_0_VALUES');
 		Configuration::deleteByName('PS_LAYERED_SHOW_QTIES');
+		Configuration::deleteByName('PS_LAYERED_INDEXED');
 		
 		Db::getInstance()->Execute('DROP TABLE IF EXISTS '._DB_PREFIX_.'layered_price_index');
 		Db::getInstance()->Execute('DROP TABLE IF EXISTS '._DB_PREFIX_.'layered_friendly_url');
@@ -96,7 +103,7 @@ class BlockLayered extends Module
 		return parent::uninstall();
 	}
 	
-	private function _installPriceIndexTable()
+	private static function _installPriceIndexTable()
 	{
 		Db::getInstance()->Execute('DROP TABLE IF EXISTS `'._DB_PREFIX_.'layered_price_index`');
 		
@@ -986,7 +993,8 @@ class BlockLayered extends Module
 		
 			Db::getInstance()->Execute('
 			INSERT INTO `'._DB_PREFIX_.'layered_price_index` (id_product, id_currency, price_min, price_max)
-			VALUES '.implode(',', $values));
+			VALUES '.implode(',', $values).'
+			ON DUPLICATE KEY UPDATE id_product = id_product # avoid duplicate keys');
 	}
 
 	public function hookLeftColumn($params)