Unknown error type: [8] Trying to get property of non-object
#0  bt_error_handler(8, Trying to get property of non-object, /mnt/persist/www/docroot/sites/all/modules/Bt/bt.module, 419, Array ([category] => BT_Category Object ([] => BT_Category,[] => bt_category,[] => category_id,[] => Array ([category_id] => Array ([null] => ),[parent_id] => Array ([type] => BT_Api_Db_Category),[alias_id] => Array ([type] => BT_Api_Db_Category),[title] => Array ([null] => ),[slug] => Array (),[image] => Array (),[sort] => Array ([default] => ),[nb_articles] => Array ([default] => 0),[nb_categories] => Array ([default] => 0),[last_update] => Array (),[created] => Array ()),[] => Array ([category_property] => BT_CategoryProperty,[category_text] => BT_CategoryText),[] => Array ([category_id] => 3310,[parent_id] => 3300,[alias_id] => ,[title] => Lærredsbånd bredde 50 mm,[slug] => slibning--slibeband--larredsband-bredde-50-mm,[image] => Slibebaand.jpg,[sort] => ,[nb_articles] => 230,[nb_categories] => 0,[last_update] => 2018-07-21 15:31:59,[created] => 2018-07-21 15:31:55,[category_property] => BT_Api_Db_Collection Object ([0] => BT_CategoryProperty Object ([] => BT_CategoryProperty,[] => bt_category_property,[] => category_property_id,[] => Array ([category_property_id] => Array ([null] => 1,[ai] => 1),[category_id] => Array ([null] => ,[type] => BT_Category),[property] => Array ([null] => ),[value] => Array (),[sort] => Array (),[lang] => Array ()),[] => Array (),[] => Array ([category_property_id] => 15462998,[category_id] => 3310,[property] => template,[value] => 1,[sort] => ,[lang] => ),[] => 1,[] => 1,[] => ),[1] => BT_CategoryProperty Object ([] => BT_CategoryProperty,[] => bt_category_property,[] => category_property_id,[] => Array ([category_property_id] => Array ([null] => 1,[ai] => 1),[category_id] => Array ([null] => ,[type] => BT_Category),[property] => Array ([null] => ),[value] => Array (),[sort] => Array (),[lang] => Array ()),[] => Array (),[] => Array ([category_property_id] => 15462999,[category_id] => 3310,[property] => page_title,[value] => ,[sort] => ,[lang] => ),[] => 1,[] => 1,[] => )),[category_text] => BT_Api_Db_Collection Object ()),[] => 1,[] => 1,[] => ),[article] => ,[breadcrumb] => Array ([0] => Hjem,[1] => Slibning,[2] => Slibebånd,[3] => Lærredsbånd bredde 50 mm))) called at [/mnt/persist/www/docroot/sites/all/modules/Bt/bt.module:419]
#1  bt_article(BT_Category Object ([] => BT_Category,[] => bt_category,[] => category_id,[] => Array ([category_id] => Array ([null] => ),[parent_id] => Array ([type] => BT_Api_Db_Category),[alias_id] => Array ([type] => BT_Api_Db_Category),[title] => Array ([null] => ),[slug] => Array (),[image] => Array (),[sort] => Array ([default] => ),[nb_articles] => Array ([default] => 0),[nb_categories] => Array ([default] => 0),[last_update] => Array (),[created] => Array ()),[] => Array ([category_property] => BT_CategoryProperty,[category_text] => BT_CategoryText),[] => Array ([category_id] => 3310,[parent_id] => 3300,[alias_id] => ,[title] => Lærredsbånd bredde 50 mm,[slug] => slibning--slibeband--larredsband-bredde-50-mm,[image] => Slibebaand.jpg,[sort] => ,[nb_articles] => 230,[nb_categories] => 0,[last_update] => 2018-07-21 15:31:59,[created] => 2018-07-21 15:31:55,[category_property] => BT_Api_Db_Collection Object ([0] => BT_CategoryProperty Object ([] => BT_CategoryProperty,[] => bt_category_property,[] => category_property_id,[] => Array ([category_property_id] => Array ([null] => 1,[ai] => 1),[category_id] => Array ([null] => ,[type] => BT_Category),[property] => Array ([null] => ),[value] => Array (),[sort] => Array (),[lang] => Array ()),[] => Array (),[] => Array ([category_property_id] => 15462998,[category_id] => 3310,[property] => template,[value] => 1,[sort] => ,[lang] => ),[] => 1,[] => 1,[] => ),[1] => BT_CategoryProperty Object ([] => BT_CategoryProperty,[] => bt_category_property,[] => category_property_id,[] => Array ([category_property_id] => Array ([null] => 1,[ai] => 1),[category_id] => Array ([null] => ,[type] => BT_Category),[property] => Array ([null] => ),[value] => Array (),[sort] => Array (),[lang] => Array ()),[] => Array (),[] => Array ([category_property_id] => 15462999,[category_id] => 3310,[property] => page_title,[value] => ,[sort] => ,[lang] => ),[] => 1,[] => 1,[] => )),[category_text] => BT_Api_Db_Collection Object ()),[] => 1,[] => 1,[] => ), )
#2  call_user_func_array(bt_article, Array ([0] => BT_Category Object ([] => BT_Category,[] => bt_category,[] => category_id,[] => Array ([category_id] => Array ([null] => ),[parent_id] => Array ([type] => BT_Api_Db_Category),[alias_id] => Array ([type] => BT_Api_Db_Category),[title] => Array ([null] => ),[slug] => Array (),[image] => Array (),[sort] => Array ([default] => ),[nb_articles] => Array ([default] => 0),[nb_categories] => Array ([default] => 0),[last_update] => Array (),[created] => Array ()),[] => Array ([category_property] => BT_CategoryProperty,[category_text] => BT_CategoryText),[] => Array ([category_id] => 3310,[parent_id] => 3300,[alias_id] => ,[title] => Lærredsbånd bredde 50 mm,[slug] => slibning--slibeband--larredsband-bredde-50-mm,[image] => Slibebaand.jpg,[sort] => ,[nb_articles] => 230,[nb_categories] => 0,[last_update] => 2018-07-21 15:31:59,[created] => 2018-07-21 15:31:55,[category_property] => BT_Api_Db_Collection Object ([0] => BT_CategoryProperty Object ([] => BT_CategoryProperty,[] => bt_category_property,[] => category_property_id,[] => Array ([category_property_id] => Array ([null] => 1,[ai] => 1),[category_id] => Array ([null] => ,[type] => BT_Category),[property] => Array ([null] => ),[value] => Array (),[sort] => Array (),[lang] => Array ()),[] => Array (),[] => Array ([category_property_id] => 15462998,[category_id] => 3310,[property] => template,[value] => 1,[sort] => ,[lang] => ),[] => 1,[] => 1,[] => ),[1] => BT_CategoryProperty Object ([] => BT_CategoryProperty,[] => bt_category_property,[] => category_property_id,[] => Array ([category_property_id] => Array ([null] => 1,[ai] => 1),[category_id] => Array ([null] => ,[type] => BT_Category),[property] => Array ([null] => ),[value] => Array (),[sort] => Array (),[lang] => Array ()),[] => Array (),[] => Array ([category_property_id] => 15462999,[category_id] => 3310,[property] => page_title,[value] => ,[sort] => ,[lang] => ),[] => 1,[] => 1,[] => )),[category_text] => BT_Api_Db_Collection Object ()),[] => 1,[] => 1,[] => ),[1] => )) called at [/mnt/persist/www/docroot/includes/menu.inc:527]
#3  menu_execute_active_handler() called at [/mnt/persist/www/docroot/index.php:21]