diff --git a/node_modules/frontdoor/lib/types.js b/node_modules/frontdoor/lib/types.js
index 9256c8aa..1980238a 100644
--- a/node_modules/frontdoor/lib/types.js
+++ b/node_modules/frontdoor/lib/types.js
@@ -53,6 +53,7 @@ exports.RegExp.prototype.parse = function(value) {
     return value.toString();
 };
 exports.RegExp.prototype.check = function(value) {
+    if (typeof value !== "string") return false;
     value = value.toString();
     var match = value.match(this.re);
     return match && value === match[0];