[Refactor] bail earlier when the value is falsy.

index.js

@@ -14,7 +14,7 @@ var regexClass = '[object RegExp]';
 var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
 
 module.exports = function isRegex(value) {
-	if (typeof value !== 'object') {
+	if (!value || typeof value !== 'object') {
 		return false;
 	}
 	return hasToStringTag ? tryRegexExecCall(value) : toStr.call(value) === regexClass;