diff --git a/kivy/modules/_webdebugger.py b/kivy/modules/_webdebugger.py
index d40781173..612fbc0a7 100644
--- a/kivy/modules/_webdebugger.py
+++ b/kivy/modules/_webdebugger.py
@@ -64,7 +64,7 @@ class FlaskThread(threading.Thread):
         m['Python garbage'].append(len(garbage))
         m['FPS (internal)'].append(Clock.get_fps())
         m['FPS (real)'].append(Clock.get_rfps())
-        m['Events'].append(sum([len(x) for x in Clock._events.values()]))
+        m['Events'].append(sum([len(x) for x in Clock._events]))
         for category in Cache._categories:
             m['Cache ' + category].append(
                 len(Cache._objects.get(category, [])))