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/examples/react/src/examples/UseNodesData/index.tsx b/examples/react/src/examples/UseNodesData/index.tsx
index dabc1d4d..c00e26a1 100644
--- a/examples/react/src/examples/UseNodesData/index.tsx
+++ b/examples/react/src/examples/UseNodesData/index.tsx
@@ -21,7 +21,7 @@ export type UppercaseNode = Node<{ text: string }, 'uppercase'>;
 export type MyNode = TextNode | ResultNode | UppercaseNode;
 
 export function isTextNode(node: any): node is TextNode | UppercaseNode {
-  return node.type === 'text' || node.type === 'uppercase';
+  return !node || !node.type ? false : node.type === 'text' || node.type === 'uppercase';
 }
 
 const nodeTypes = {
diff --git a/examples/svelte/src/routes/examples/usenodesdata/+page.svelte b/examples/svelte/src/routes/examples/usenodesdata/+page.svelte
index 91fd8432..8f041b0a 100644
--- a/examples/svelte/src/routes/examples/usenodesdata/+page.svelte
+++ b/examples/svelte/src/routes/examples/usenodesdata/+page.svelte
@@ -6,7 +6,7 @@
 	type ResultNodeType = Node<{}, 'result'>;
 
 	export function isTextNode(node: any): node is TextNodeType | UppercaseNode {
-		return node.type === 'text' || node.type === 'uppercase';
+		return !node || !node.type ? false : node.type === 'text' || node.type === 'uppercase';
 	}
 
 	export type MyNode = TextNodeType | UppercaseNodeType | ResultNodeType;
diff --git a/packages/svelte/src/lib/hooks/useNodesData.ts b/packages/svelte/src/lib/hooks/useNodesData.ts
index a13bdb65..2e8fba50 100644
--- a/packages/svelte/src/lib/hooks/useNodesData.ts
+++ b/packages/svelte/src/lib/hooks/useNodesData.ts
@@ -22,6 +22,7 @@ export function useNodesData(nodeIds: any): any {
   const { nodes, nodeLookup } = useStore();
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   let prevNodesData: any[] = [];
+  let initialRun = true;
 
   return derived([nodes, nodeLookup], ([, nodeLookup], set) => {
     const nextNodesData = [];
@@ -39,9 +40,10 @@ export function useNodesData(nodeIds: any): any {
       }
     }
 
-    if (!shallowNodeData(nextNodesData, prevNodesData)) {
+    if (!shallowNodeData(nextNodesData, prevNodesData) || initialRun) {
       prevNodesData = nextNodesData;
       set(isArrayOfIds ? nextNodesData : nextNodesData[0] ?? null);
+      initialRun = false;
     }
   });
 }