diff --git a/src/frontend/src/utils.ts b/src/frontend/src/utils.ts
index 4fc7cb016..d44bdf5e6 100644
--- a/src/frontend/src/utils.ts
+++ b/src/frontend/src/utils.ts
@@ -598,7 +598,7 @@ export function isValidConnection(
       ) ||
     targetHandle.split("|")[0] === "str"
   ) {
-    let targetNode = reactFlowInstance.getNode(target).data.node;
+    let targetNode = reactFlowInstance?.getNode(target)?.data?.node;
     if (!targetNode) {
       if (
         !reactFlowInstance