diff --git a/src/layout/dock/index.tsx b/src/layout/dock/index.tsx
index 560baf8..89fd047 100644
--- a/src/layout/dock/index.tsx
+++ b/src/layout/dock/index.tsx
@@ -30,6 +30,7 @@ export default defineComponent(() => {
                 const oldIdx = layout.currentPage.list.findIndex((el) => el.id === dragging.id)
                 if (oldIdx < 0) return
                 const block = layout.currentPage.list[oldIdx]
+                if (!block) return
                 layout.state.dock[i] = block
                 layout.currentPage.list.splice(oldIdx, 1)
                 return