send empty string if no error and not op

4chan_x.user.js

@@ -1552,6 +1552,9 @@
           });
         } else if (node = $('meta')) {
           data = node.content.match(/url=(.+)/)[1];
+          if (/#/.test(data)) {
+            data = '';
+          }
         }
         return parent.postMessage(data, '*');
       });

script.coffee

@@ -1205,6 +1205,7 @@ QR =
         data = JSON.stringify {textContent, href}
       else if node = $ 'meta'
         data = node.content.match(/url=(.+)/)[1]
+        if /#/.test data then data = '' #not op
       parent.postMessage data, '*'
       #if we're an iframe, parent will blank us