diff --git a/src/client/src/tscSQLParserImpl.c b/src/client/src/tscSQLParserImpl.c
index 1bd43fe4903ac86d9bc2ab255d6d65b04509e779..5ceb5c02067688e7e77dcb0aa05848f27b0120b7 100644
--- a/src/client/src/tscSQLParserImpl.c
+++ b/src/client/src/tscSQLParserImpl.c
@@ -48,6 +48,7 @@ int32_t tSQLParse(SSqlInfo *pSQLInfo, const char *pStr) {
         Parse(pParser, 0, t0, pSQLInfo);
         goto abort_parse;
       }
+      case TK_QUESTION:
       case TK_ILLEGAL: {
         snprintf(pSQLInfo->pzErrMsg, tListLen(pSQLInfo->pzErrMsg), "unrecognized token: \"%s\"", t0.z);
         pSQLInfo->valid = false;