Issue #2004062 by TravisJohnston , d.pagkratis : The error is fixed. The...

Issue #2004062 by TravisJohnston , d.pagkratis : The error is fixed. The problem was caused from the ajax callback impacting on trying to change the price value and then the function was trying to make also the change. Your solution was not the best because you were setting the price to zero before the if statement