diff --git a/stack.sh b/stack.sh
index 7a7655c..9b9c245 100755
--- a/stack.sh
+++ b/stack.sh
@@ -631,7 +631,11 @@
 
     if [[ $r -ne 0 ]]; then
         echo "Error on exit"
-        ./tools/worlddump.py -d $LOGDIR
+        if [[ -z $LOGDIR ]]; then
+            ./tools/worlddump.py
+        else
+            ./tools/worlddump.py -d $LOGDIR
+        fi
     fi
 
     exit $r