diff --git a/lib/eventslib.php b/lib/eventslib.php
index 9cc29382abbca..6ceaf5e0059dd 100644
--- a/lib/eventslib.php
+++ b/lib/eventslib.php
@@ -345,7 +345,11 @@ function events_process_queued_handler($qhandler) {
     } catch (Exception $e) {
         // the problem here is that we do not want one broken handler to stop all others,
         // cron handlers are very tricky because the needed data might have been deleted before the cron execution
-        $errormessage = "Handler function of component $handler->component: $handler->handlerfunction threw exception :".$e->getMessage();
+        $errormessage = "Handler function of component $handler->component: $handler->handlerfunction threw exception :" .
+                $e->getMessage() . "\n" . format_backtrace($e->getTrace(), true);
+        if (!empty($e->debuginfo)) {
+            $errormessage .= $e->debuginfo;
+        }
     }
 
     //dispatching failed