diff --git a/Api/src/main/java/allchive/server/api/common/util/UrlUtil.java b/Api/src/main/java/allchive/server/api/common/util/UrlUtil.java
index 2ffe0bbb..5ad6489f 100644
--- a/Api/src/main/java/allchive/server/api/common/util/UrlUtil.java
+++ b/Api/src/main/java/allchive/server/api/common/util/UrlUtil.java
@@ -29,6 +29,9 @@ public static String toAssetUrl(String key) {
     }
 
     public static String convertUrlToKey(String url) {
+        if (url == null) {
+            return "";
+        }
         if (url.equals("")) {
             return "";
         }