Lookup task only if list has items

xavierp · Mar 26, 2017 · 522ef61 · 522ef61
1 parent 0ad41a0
commit 522ef61
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/celery/canvas.py b/celery/canvas.py
@@ -1337,7 +1337,8 @@ def _get_app(self, body=None):
                 tasks = self.tasks.tasks  # is a group
             except AttributeError:
                 tasks = self.tasks
-            app = tasks[0]._app
+            if len(tasks):
+                app = tasks[0]._app
             if app is None and body is not None:
                 app = body._app
         return app if app is not None else current_app