diff --git a/src/main/java/com/kimgo/wepush/controller/CallerController.java b/src/main/java/com/kimgo/wepush/controller/CallerController.java
index 1e01384..39f4a57 100644
--- a/src/main/java/com/kimgo/wepush/controller/CallerController.java
+++ b/src/main/java/com/kimgo/wepush/controller/CallerController.java
@@ -20,7 +20,7 @@ public class CallerController {
     public ServerResponseEntity receiveCall(@RequestHeader("accessToken") String accessToken,
                                             @RequestBody @Valid CallInfo callInfo) {
         logger.info("CallInfoO: {}",callInfo.toString());
-        if(accessToken == null){
+        if(accessToken == null || callInfo == null){
             return ServerResponseEntity.fail("accessToken cannot be empty.");
         }
         if(callInfo.getPhoneNumber().equals("null") || callInfo.getCallTime().equals("null")){