diff --git a/vue/src/system/GraphDemo.vue b/vue/src/system/GraphDemo.vue
index fe1b291..d7be885 100644
--- a/vue/src/system/GraphDemo.vue
+++ b/vue/src/system/GraphDemo.vue
@@ -864,10 +864,10 @@ export default {
       // 比如如果你有高亮定时器，这里 clearTimeout
     },
     formatData(data) {
+      if (!this._graph) return;
       this._graph.stopLayout();
       this.clearGraphState();
 
-
       // === 1. 构建 nodeId → label 映射 ===
       const nodeIdToEnLabel = {};
       data.nodes.forEach(node => {
@@ -922,7 +922,6 @@ export default {
         nodes: updatedNodes,
         edges: updatedEdges
       };
-
       this.buildNodeLabelMap(updatedNodes);
       this.updateGraph(updatedData)
       this.buildCategoryIndex();
@@ -1195,7 +1194,7 @@ export default {
             console.log(e)
             const edge = items[0]; // 当前悬停的边
             if (!edge) return '';
-            const data=items[0].data
+            const data = items[0].data
             const sourceId = edge.source;
             const targetId = edge.target;