Merge pull request #7091 from taosdata/fix/TD-5539

[TD-5539]<fix> fix core dump caused by unsupport query statement

src/client/src/tscUtil.c

@@ -2790,7 +2790,8 @@ void tscDequoteAndTrimToken(SStrToken* pToken) {
 }
 
 int32_t tscValidateName(SStrToken* pToken) {
-  if (pToken->type != TK_STRING && pToken->type != TK_ID) {
+  if (pToken == NULL || pToken->z == NULL ||
+  (pToken->type != TK_STRING && pToken->type != TK_ID)) {
     return TSDB_CODE_TSC_INVALID_OPERATION;
   }