diff --git a/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/BaseClientErrorHandler.java b/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/BaseClientErrorHandler.java
index 82c53acaf..6b5d9a0c3 100644
--- a/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/BaseClientErrorHandler.java
+++ b/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/BaseClientErrorHandler.java
@@ -73,7 +73,7 @@ boolean isInvalidInfo(ClientErrorInfo info) {
     }
 
     private void removeTask(String taskId) {
-        if (StringUtils.isNoneBlank(taskId)) {
+        if (StringUtils.isNotBlank(taskId)) {
             remover.add(taskId, true);
         }
     }
diff --git a/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/FileMd5NotMatchHandler.java b/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/FileMd5NotMatchHandler.java
index 511d770b1..6d3c01929 100644
--- a/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/FileMd5NotMatchHandler.java
+++ b/src/supernode/src/main/java/com/dragonflyoss/dragonfly/supernode/service/repair/FileMd5NotMatchHandler.java
@@ -129,6 +129,9 @@ private String getMd5FromMeta(String taskId, String range) {
             return null;
         }
         List<String> pieceMd5s = fileMetaDataService.readPieceMd5(taskId, meta.getRealMd5());
+        if (pieceMd5s == null) {
+            return null;
+        }
 
         return pieceMd5s.size() > pieceNum ? pieceMd5s.get(pieceNum) : null;
     }