diff --git a/itemwatch.lua b/itemwatch.lua
index ca60fd3..ef31133 100644
--- a/itemwatch.lua
+++ b/itemwatch.lua
@@ -308,6 +308,8 @@ ashita.register_event('command', function(cmd, ntype)
         lists.clear_watched_keys();
         return true;
     end
+
+    return true;
 end);
 
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