Fixed module check to avoid possible ReferenceError
Fixed module check to avoid possible ReferenceError

kwangkim/classnames,JedWatson/classnames,JedWatson/classnames,StephenGrider/classnames,fattenap/classnames,Khan/classnames,ento/classnames,victor-homyakov/classnames,JedWatson/classnames,longlho/classnames,beni55/classnames,victor-homyakov/classnames