diff --git a/src/common/graph/graph.ts b/src/common/graph/graph.ts
index f4701415bb5728d988883855191f184f5b7b987b..49e147de574996b2d376d28cfc7c225c28aa8742 100644
--- a/src/common/graph/graph.ts
+++ b/src/common/graph/graph.ts
@@ -183,7 +183,7 @@ export class Graph
         this.idToNode.set(node.id, node);
     }
 
-    public createNode(data?: NodeData): Node {
+    public createNode(data?: NodeData | SimNodeData): Node {
         const node = new Node(this);
         node.fromSerializedObject(data);
         node.type = this.nameToObjectGroup.get(data.type);