Laravel 5.1: Unsupported operand types (FatalErrorException in …)

Ok. When I am upgrading my application from Laravel 5.0 to 5.1 I get an falat error that this showing "Unsupported operand types"   What did I do on Laravel 5.0: I add two array with in + operator, and that is the problem. So, I looking for solution and get this on Laracast $item_list …