diff --git a/src/lib/Hydra/Controller/API.pm b/src/lib/Hydra/Controller/API.pm
index 8bb710e0..a084a3a8 100644
--- a/src/lib/Hydra/Controller/API.pm
+++ b/src/lib/Hydra/Controller/API.pm
@@ -88,7 +88,7 @@ sub jobsetToHash {
         triggertime => $jobset->triggertime,
         fetcherrormsg => $jobset->fetcherrormsg,
         errortime => $jobset->errortime,
-        haserrormsg => $jobset->errormsg eq "" ? JSON::false : JSON::true
+        haserrormsg => defined($jobset->errormsg) && $jobset->errormsg ne "" ? JSON::true : JSON::false
     };
 }