diff --git a/libraries/classes/ErrorReport.php b/libraries/classes/ErrorReport.php
index 9b8868c1e2..b9e3e268a7 100644
--- a/libraries/classes/ErrorReport.php
+++ b/libraries/classes/ErrorReport.php
@@ -95,7 +95,7 @@ class ErrorReport
             }
             $exception = $_REQUEST['exception'];
             $exception["stack"] = $this->translateStacktrace($exception["stack"]);
-            list($uri, $scriptName) = $this->sanitizeUrl($exception["url"]);
+            list($uri, $scriptName) = $this->sanitizeUrl((string)$exception["url"]);
             $exception["uri"] = $uri;
             unset($exception["url"]);