diff --git a/jsowell-pile/src/main/java/com/jsowell/pile/service/impl/ChargeAlgorithmRecordServiceImpl.java b/jsowell-pile/src/main/java/com/jsowell/pile/service/impl/ChargeAlgorithmRecordServiceImpl.java
index 46076aa1b..b7e7d0323 100644
--- a/jsowell-pile/src/main/java/com/jsowell/pile/service/impl/ChargeAlgorithmRecordServiceImpl.java
+++ b/jsowell-pile/src/main/java/com/jsowell/pile/service/impl/ChargeAlgorithmRecordServiceImpl.java
@@ -134,7 +134,7 @@ public class ChargeAlgorithmRecordServiceImpl implements ChargeAlgorithmRecordSe
             // 2-pdf 端
             return record.getPdfUrl();
         }
-        return null;
+        return "";
     }
 
     /**