diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/insert/BaseExternalTableInsertExecutor.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/insert/BaseExternalTableInsertExecutor.java
index 082f1bab7d..ab7b6d3e36 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/insert/BaseExternalTableInsertExecutor.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/insert/BaseExternalTableInsertExecutor.java
@@ -22,6 +22,7 @@ import org.apache.doris.common.ErrorCode;
 import org.apache.doris.common.UserException;
 import org.apache.doris.common.profile.SummaryProfile;
 import org.apache.doris.common.util.DebugUtil;
+import org.apache.doris.common.util.Util;
 import org.apache.doris.datasource.ExternalTable;
 import org.apache.doris.nereids.NereidsPlanner;
 import org.apache.doris.nereids.exceptions.AnalysisException;
@@ -113,7 +114,7 @@ public abstract class BaseExternalTableInsertExecutor extends AbstractInsertExec
 
     @Override
     protected void onFail(Throwable t) {
-        errMsg = t.getMessage() == null ? "unknown reason" : t.getMessage();
+        errMsg = Util.getRootCauseMessage(t);
         String queryId = DebugUtil.printId(ctx.queryId());
         // if any throwable being thrown during insert operation, first we should abort this txn
         LOG.warn("insert [{}] with query id {} failed", labelName, queryId, t);