diff --git a/src/trame_flow/module/core.py b/src/trame_flow/module/core.py
index 45d6633..7c27416 100644
--- a/src/trame_flow/module/core.py
+++ b/src/trame_flow/module/core.py
@@ -100,7 +100,7 @@ def create_node(
     if style:
         node["style"] = style
     if data:
-        node["data"] = node["data"] or data
+        node["data"].update(data)
     # set default node style for custom node
     if type not in ["default", "input", "output"]:
         node["class"] = "vue-flow__node-default"