diff --git a/renren-admin/src/main/java/io/renren/modules/resource/dto/ResourceDTO.java b/renren-admin/src/main/java/io/renren/modules/resource/dto/ResourceDTO.java
index a4ed16b9..ec0f58e1 100644
--- a/renren-admin/src/main/java/io/renren/modules/resource/dto/ResourceDTO.java
+++ b/renren-admin/src/main/java/io/renren/modules/resource/dto/ResourceDTO.java
@@ -99,13 +99,13 @@ public class ResourceDTO implements Serializable {
 
     public String getDelFlagTip() {
         if (this.delFlag != null) {
-            Optional<ResourceEntityDelFlag> resourceEntityDelFlagOptional = Optional.of(ResourceEntityDelFlag.getByFlag(this.delFlag));
+            Optional<ResourceEntityDelFlag> resourceEntityDelFlagOptional = Optional.ofNullable(ResourceEntityDelFlag.getByFlag(this.delFlag));
             if (resourceEntityDelFlagOptional.isPresent()) {
                 return resourceEntityDelFlagOptional.get().getTip();
             }
-            return delFlagTip;
+            return "";
         }
-        return delFlagTip;
+        return "";
     }
 
     public void setDelFlagTip(String delFlagTip) {
diff --git a/renren-admin/src/main/java/io/renren/modules/resource/entity/ResourceEntityDelFlag.java b/renren-admin/src/main/java/io/renren/modules/resource/entity/ResourceEntityDelFlag.java
index 65eba940..0f97a212 100644
--- a/renren-admin/src/main/java/io/renren/modules/resource/entity/ResourceEntityDelFlag.java
+++ b/renren-admin/src/main/java/io/renren/modules/resource/entity/ResourceEntityDelFlag.java
@@ -25,9 +25,6 @@ public enum ResourceEntityDelFlag {
     }
 
     public static ResourceEntityDelFlag getByFlag(int flag) {
-        if (flag < 1 || flag > ResourceEntityDelFlag.values().length) {
-            return null;
-        }
         ResourceEntityDelFlag[] index = ResourceEntityDelFlag.values();
         return Arrays.asList(index).stream().filter(index_ -> index_.flag == flag).findAny().orElse(null);
     }