taakotuesday

hey guys, i've been having a problem with tekkit lite where it crashes anytime i press alt+w, which i do a lot because i usually set alt as my sprint key. i've tried everything i can think of to fix it but nothing has worked and it's made the game impossible to play because i keep accidentally pressing alt out of habit. i've googled around and i can't see where anyone else has had this problem. can anyone help me?