diff --git a/.changeset/brave-worms-study.md b/.changeset/brave-worms-study.md
new file mode 100644
index 00000000..123459fe
--- /dev/null
+++ b/.changeset/brave-worms-study.md
@@ -0,0 +1,5 @@
+---
+'@xyflow/svelte': patch
+---
+
+Fixed hook useNodesData unexpectedly returning undefined
diff --git a/packages/svelte/src/lib/hooks/useNodesData.ts b/packages/svelte/src/lib/hooks/useNodesData.ts
index e4d8dd36..2e8fba50 100644
--- a/packages/svelte/src/lib/hooks/useNodesData.ts
+++ b/packages/svelte/src/lib/hooks/useNodesData.ts
@@ -41,7 +41,7 @@ export function useNodesData(nodeIds: any): any {
     }
 
     if (!shallowNodeData(nextNodesData, prevNodesData) || initialRun) {
-      prevNodesData = [...nextNodesData];
+      prevNodesData = nextNodesData;
       set(isArrayOfIds ? nextNodesData : nextNodesData[0] ?? null);
       initialRun = false;
     }