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-rw-r--r--bin/workflow/wkf_expr.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/bin/workflow/wkf_expr.py b/bin/workflow/wkf_expr.py
index 9a86b474f86..f1476cc8188 100644
--- a/bin/workflow/wkf_expr.py
+++ b/bin/workflow/wkf_expr.py
@@ -70,6 +70,7 @@ class Env(dict):
def _eval_expr(cr, ident, workitem, action):
ret=False
+ assert action, 'You used a NULL action in a workflow, use dummy node instead.'
for line in action.split('\n'):
uid=ident[0]
model=ident[1]