diff --git a/src/editor/core/position/Position.ts b/src/editor/core/position/Position.ts
index be0c423..83ab088 100644
--- a/src/editor/core/position/Position.ts
+++ b/src/editor/core/position/Position.ts
@@ -189,7 +189,7 @@ export class Position {
     }
     return {
       index: curPositionIndex,
-      isControl: elementList[curPositionIndex].type === ElementType.CONTROL
+      isControl: elementList[curPositionIndex]?.type === ElementType.CONTROL
     }
   }