diff --git a/backend/src/main/java/io/metersphere/service/RelationshipEdgeService.java b/backend/src/main/java/io/metersphere/service/RelationshipEdgeService.java
index 9a1bb097db..b566aa55f3 100644
--- a/backend/src/main/java/io/metersphere/service/RelationshipEdgeService.java
+++ b/backend/src/main/java/io/metersphere/service/RelationshipEdgeService.java
@@ -43,11 +43,12 @@ public class RelationshipEdgeService {
         example.createCriteria()
                 .andSourceIdEqualTo(sourceId)
                 .andTargetIdEqualTo(targetId);
-
-        String graphId = relationshipEdgeMapper.selectByExample(example).get(0).getGraphId();
-        updateGraphId(graphId, sourceId, targetId);
-
-        relationshipEdgeMapper.deleteByExample(example);
+        List<RelationshipEdge> list = relationshipEdgeMapper.selectByExample(example);
+        if (CollectionUtils.isNotEmpty(list)) {
+            String graphId = relationshipEdgeMapper.selectByExample(example).get(0).getGraphId();
+            updateGraphId(graphId, sourceId, targetId);
+            relationshipEdgeMapper.deleteByExample(example);
+        }
     }
 
     public void delete(String sourceId ,List<String> targetIds) {