diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index b315a6118..8302e00bb 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -1270,6 +1270,7 @@ devspec2array($;$)
 
         if($@) {
           Log 1, "devspec2array $name: $@";
+          stacktrace();
           return $name;
         }
       }