diff --git a/src/gausskernel/process/tcop/postgres.cpp b/src/gausskernel/process/tcop/postgres.cpp
index 6f8be28b7..2ddd79c6a 100755
--- a/src/gausskernel/process/tcop/postgres.cpp
+++ b/src/gausskernel/process/tcop/postgres.cpp
@@ -778,7 +778,8 @@ static int ReadCommand(StringInfo inBuf)
 #ifndef ENABLE_MULTIPLE_NODES
     /* Disable a timer for idle_in_transaction_session. */
     if (u_sess->attr.attr_common.IdleInTransactionSessionTimeout > 0 &&
-        u_sess->attr.attr_common.SessionTimeout > u_sess->attr.attr_common.IdleInTransactionSessionTimeout &&
+        (u_sess->attr.attr_common.SessionTimeout == 0 ||
+        u_sess->attr.attr_common.SessionTimeout > u_sess->attr.attr_common.IdleInTransactionSessionTimeout) &&
         (IsAbortedTransactionBlockState() || IsTransactionOrTransactionBlock())) {
         if (!disable_idle_in_transaction_session_sig_alarm()) {
             ereport(FATAL, (errcode(ERRCODE_SYSTEM_ERROR), errmsg("could not disable timer for idle-in-transaction timeout")));