diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/MemUtils.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/MemUtils.java
index 8596f39dc778..961a027e1037 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/MemUtils.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/MemUtils.java
@@ -203,7 +203,7 @@ public static String bytesCntToStr(long inputCnt) {
   }
 
   public static long strToBytesCnt(String str) {
-    if (str == null) {
+    if (str == null || str.isEmpty()) {
       return 0;
     }
     str = str.toLowerCase();