diff --git a/setup/test/tests/stubs.php b/setup/test/tests/stubs.php
index bfb686074afcb15f177977fc3c95b19b1970f053..fba61da31c613e7a3cae65f8ba37c8f08f599a27 100644
--- a/setup/test/tests/stubs.php
+++ b/setup/test/tests/stubs.php
@@ -36,4 +36,8 @@ class DomDocument {
     function loadHTML() {}
 }
 
+class Exception {
+    function getTraceAsString() {}
+}
+
 ?>