Merge pull request #4730 from xyflow/fix/drag-crash

Fix rare crash: remove non-null assertion while dragging

.changeset/new-rocks-mate.md

@@ -0,0 +1,7 @@
+---
+'@xyflow/system': patch
+'@xyflow/react': patch
+'@xyflow/svelte': patch
+---
+
+Fixed rare crash while dragging

packages/system/src/xydrag/utils.ts

@@ -106,14 +106,16 @@ export function getEventHandlerParams<NodeType extends InternalNodeBase>({
     return [nodesFromDragItems[0], nodesFromDragItems];
   }
 
-  const node = nodeLookup.get(nodeId)!.internals.userNode;
+  const node = nodeLookup.get(nodeId)?.internals.userNode;
 
   return [
-    {
+    !node
-      ...node,
+      ? nodesFromDragItems[0]
-      position: dragItems.get(nodeId)?.position || node.position,
+      : {
-      dragging,
+          ...node,
-    },
+          position: dragItems.get(nodeId)?.position || node.position,
+          dragging,
+        },
     nodesFromDragItems,
   ];
 }