diff --git a/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java b/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java
index e5c62f44b2..7e72e61f71 100644
--- a/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java
+++ b/backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java
@@ -707,7 +707,9 @@ public class ApiAutomationService {
             apiScenarios.forEach(item -> {
                 JSONObject object = JSONObject.parseObject(item.getScenarioDefinition());
                 object.put("environmentId", request.getEnvironmentId());
-                item.setScenarioDefinition(JSONObject.toJSONString(object));
+                if (object != null) {
+                    item.setScenarioDefinition(JSONObject.toJSONString(object));
+                }
                 apiScenarioMapper.updateByPrimaryKeySelective(item);
             });
         }