diff --git a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/DingTalkAlarmService.java b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/DingTalkAlarmService.java
index aa01d08f..f1e4ee48 100644
--- a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/DingTalkAlarmService.java
+++ b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/DingTalkAlarmService.java
@@ -51,10 +51,14 @@ public class DingTalkAlarmService implements Alarmable {
         }
         Set<String> userIds = Sets.newHashSet();
         targetUserList.forEach(user -> {
+            String phone = user.getPhone();
+            if (StringUtils.isEmpty(phone)) {
+                return;
+            }
             try {
-                String userId = mobile2UserIdCache.get(user.getPhone(), () -> {
+                String userId = mobile2UserIdCache.get(phone, () -> {
                     try {
-                        return dingTalkUtils.fetchUserIdByMobile(user.getPhone());
+                        return dingTalkUtils.fetchUserIdByMobile(phone);
                     } catch (PowerJobException ignore) {
                         return EMPTY_TAG;
                     } catch (Exception ignore) {
diff --git a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/MailAlarmService.java b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/MailAlarmService.java
index ab9a346a..2c0ca41f 100644
--- a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/MailAlarmService.java
+++ b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/alarm/impl/MailAlarmService.java
@@ -14,6 +14,7 @@ import org.springframework.util.StringUtils;
 
 import javax.annotation.Resource;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * 邮件通知服务
@@ -43,7 +44,7 @@ public class MailAlarmService implements Alarmable {
         SimpleMailMessage sm = new SimpleMailMessage();
         try {
             sm.setFrom(from);
-            sm.setTo(targetUserList.stream().map(UserInfoDO::getEmail).toArray(String[]::new));
+            sm.setTo(targetUserList.stream().map(UserInfoDO::getEmail).filter(Objects::nonNull).toArray(String[]::new));
             sm.setSubject(alarm.fetchTitle());
             sm.setText(alarm.fetchContent());
 
diff --git a/powerjob-server/src/test/java/com/github/kfcfans/powerjob/server/test/UtilsTest.java b/powerjob-server/src/test/java/com/github/kfcfans/powerjob/server/test/UtilsTest.java
index c6ebe28b..c8b52f20 100644
--- a/powerjob-server/src/test/java/com/github/kfcfans/powerjob/server/test/UtilsTest.java
+++ b/powerjob-server/src/test/java/com/github/kfcfans/powerjob/server/test/UtilsTest.java
@@ -1,6 +1,5 @@
 package com.github.kfcfans.powerjob.server.test;
 
-import com.github.kfcfans.powerjob.server.OhMyApplication;
 import com.github.kfcfans.powerjob.server.common.utils.CronExpression;
 import com.github.kfcfans.powerjob.server.common.utils.timewheel.HashedWheelTimer;
 import com.github.kfcfans.powerjob.server.common.utils.timewheel.TimerFuture;
@@ -11,9 +10,11 @@ import org.junit.Test;
 
 import java.util.Date;
 import java.util.List;
+import java.util.Objects;
 import java.util.TimeZone;
 import java.util.concurrent.ThreadLocalRandom;
 import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
 
 /**
  * 工具类测试
@@ -92,4 +93,11 @@ public class UtilsTest {
         System.out.println(StringUtils.containsWhitespace(goodAppName));
         System.out.println(StringUtils.containsWhitespace(appName));
     }
+
+    @Test
+    public void filterTest() {
+        List<String> test = Lists.newArrayList("A", "B", null, "C", null);
+        List<String> list = test.stream().filter(Objects::nonNull).collect(Collectors.toList());
+        System.out.println(list);
+    }
 }