This needs to be a string.

diff --git a/framework/Core/lib/Horde.php b/framework/Core/lib/Horde.php
index caa911e..c7f8d34 100644 (file)
--- a/framework/Core/lib/Horde.php
+++ b/framework/Core/lib/Horde.php
@@ -1119,7 +1119,7 @@ HTML;
             $uri = $webroot . $uri;
         }
 
-        return self::url($uri, $full, $append_session);
+        return (string) self::url($uri, $full, $append_session);
     }
 
     /**