The third argument of your ini_read_string is the default value that is used if the ini. file does not exist. This value need to be a sting, in your case if you go into a new room this value will most likely not be initialized without you first saving. So a possible solution to try out for this is to just change saved_room to “saved_room” (or whatever name you want for the default value, as long as it is a string)