// fix redirection

classes/shop/Shop.php

@@ -281,7 +281,8 @@ class ShopCore extends ObjectModel
 						$main_uri = $row['uri'];
 						break;
 					}
-
+				if (isset($main_uri))
+				{
 					// extract url parameters
 					$request_uri = substr($request_uri, strlen($found_uri));
 
@@ -291,6 +292,7 @@ class ShopCore extends ObjectModel
 					exit;
 				}
 			}
+		}
 
 		if (!$id_shop && defined('_PS_ADMIN_DIR_'))
 		{