diff --git a/agent/canvas.py b/agent/canvas.py
index bb13ab6c3..fa78762fb 100644
--- a/agent/canvas.py
+++ b/agent/canvas.py
@@ -235,7 +235,7 @@ class Canvas:
             pid = self.components[cid]["parent_id"]
             o, _ = self.components[cid]["obj"].output(allow_partial=False)
             oo, _ = self.components[pid]["obj"].output(allow_partial=False)
-            self.components[pid]["obj"].set(pd.concat([oo, o], ignore_index=True).dropna())
+            self.components[pid]["obj"].set_output(pd.concat([oo, o], ignore_index=True).dropna())
             downstream = [pid]
 
         for m in prepare2run(downstream):