diff --git a/src/parser/PhutilURI.php b/src/parser/PhutilURI.php
--- a/src/parser/PhutilURI.php
+++ b/src/parser/PhutilURI.php
@@ -48,11 +48,7 @@
     // Reject ambiguous URIs outright. Different versions of different clients
     // parse these in different ways. See T12526 for discussion.
     if (preg_match('(^[^/:]*://[^/]*[#?].*:)', $uri)) {
-      throw new Exception(
-        pht(
-          'Rejecting ambiguous URI "%s". This URI is not formatted or '.
-          'encoded properly.',
-          $uri));
+      return '';
     }
 
     $matches = null;