Backend issues, No callback

L 10/16/2017 - 20:49:02: [SM] Displaying call stack trace for plugin "store/store-backend.smx":
L 10/16/2017 - 20:49:02: [SM] [0] Line 966, C:\Users\Alon\Documents\GitHub\store\scripting\store-backend.sp::BuyItemGiveItemCallback()
L 10/16/2017 - 20:49:09: [SM] Native "Call_StartFunction" reported: Invalid function id (0)
L 10/16/2017 - 20:49:09: [SM] Displaying call stack trace for plugin "store/store-backend.smx":
L 10/16/2017 - 20:49:09: [SM] [0] Line 778, C:\Users\Alon\Documents\GitHub\store\scripting\store-backend.sp::T_GetUserItemsCallback()

Categorie works fine, all commands, just when i select a item in any categorie my menu is closing himself. So i can't use any item. ( I use it on css server)