Fix #187 by adding an exception handler

lib/load-watcher.js

@@ -106,7 +106,17 @@ var LoadWatcher = new Class({
 
     shouldLoad: function (contentType, contentLocation, requestOrigin, node) {
 
-        if (contentType == SCRIPT_CONTENT_TYPE && mappings[contentLocation.host]) {
+        let contentHost;
+
+        try {
+            contentHost = contentLocation.host;
+        } catch (exception) {
+
+            // Accept the resource load request.
+            return REQUEST_ACCEPTATION;
+        }
+
+        if (contentType == SCRIPT_CONTENT_TYPE && mappings[contentHost]) {
 
             if (node instanceof SCRIPT_ELEMENT) {