diff --git a/packages/grid/x-data-grid/src/hooks/features/rows/useGridRows.ts b/packages/grid/x-data-grid/src/hooks/features/rows/useGridRows.ts
index 2562e1c3d932..849560f833b0 100644
--- a/packages/grid/x-data-grid/src/hooks/features/rows/useGridRows.ts
+++ b/packages/grid/x-data-grid/src/hooks/features/rows/useGridRows.ts
@@ -440,7 +440,7 @@ export const useGridRows = (
       tree[GRID_ROOT_GROUP_ID] = { ...rootGroup, children: rootGroupChildren };
 
       // Removes potential remaining skeleton rows from the dataRowIds.
-      const dataRowIds = rootGroupChildren.filter((childId) => tree[childId].type === 'leaf');
+      const dataRowIds = rootGroupChildren.filter((childId) => tree[childId]?.type === 'leaf');
 
       apiRef.current.caches.rows.dataRowIdToModelLookup = dataRowIdToModelLookup;
       apiRef.current.caches.rows.dataRowIdToIdLookup = dataRowIdToIdLookup;