diff --git a/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/TransactionServiceImpl.java b/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/TransactionServiceImpl.java
index 42c6b831..ba5b0682 100644
--- a/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/TransactionServiceImpl.java
+++ b/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/TransactionServiceImpl.java
@@ -522,8 +522,8 @@ private Map<String, Object> decodeDataByType(String type, String arg, boolean is
                 break;
             case "Uint64":
             case "BigInt":
-                data = Helper.parseInputDataNumber(arg, isNative);
-                BigInteger number = (BigInteger) data;
+                BigInteger number = Helper.parseInputDataNumber(arg, isNative);
+                data = number.toString();
                 if (isNative) {
                     BigInteger rawNumber;
                     int value = number.intValue();