Index: branches/5.2.x/core/units/helpers/category_helper.php
===================================================================
--- branches/5.2.x/core/units/helpers/category_helper.php
+++ branches/5.2.x/core/units/helpers/category_helper.php
@@ -37,7 +37,7 @@
 		 * @param array $params        Tag params.
 		 * @param array $category_path Category parent path.
 		 *
-		 * @return array
+		 * @return array|false
 		 */
 		public function getCategoryModule(array $params, array $category_path)
 		{
@@ -57,7 +57,7 @@
 				}
 			}
 
-			return array();
+			return false;
 		}
 
 		/**
Index: branches/5.2.x/core/units/helpers/navigation_bar.php
===================================================================
--- branches/5.2.x/core/units/helpers/navigation_bar.php
+++ branches/5.2.x/core/units/helpers/navigation_bar.php
@@ -207,7 +207,7 @@
 		$category_helper = $this->Application->recallObject('CategoryHelper');
 
 		$module_info = $category_helper->getCategoryModule($this->_params, array_keys($category_path));
-		$module_item_id = $this->Application->GetVar($module_info['Var'] . '_id');
+		$module_item_id = $module_info ? $this->Application->GetVar($module_info['Var'] . '_id') : false;
 
 		$ret = '';
 		$block_params = $this->_getBaseParams();