Inputmask.escapeRegex error

[drybng]

Takes error in inputmask.js in Inputmask.escapeRegex function;

The function is;
Inputmask.escapeRegex = function(str) {
var specials = [ "/", ".", "*", "+", "?", "|", "(", ")", "[", "]", "{", "}", "\", "$", "^" ];
return str.replace(new RegExp("(\" + specials.join("|\") + ")", "gim"), "\$1");

It would be like this;
Inputmask.escapeRegex = function(str) {
var specials = [ "/", ".", "*", "+", "?", "|", "(", ")", "[", "]", "{", "}", "\", "$", "^" ];
return str ? str.replace(new RegExp("(\" + specials.join("|\") + ")", "gim"), "\$1"): str;