diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 8b2998c0e71c501ea0d13a08aa347662ca2e5ae4..3b65d0625fdb91f11bd88514ecd10811498f8004 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -4138,13 +4138,21 @@ static int32_t validateTagCondExpr(SSqlCmd* pCmd, tExprNode *p) {
     }
     
     int32_t retVal = TSDB_CODE_SUCCESS;
+
+    int32_t bufLen = 0;
+    if (IS_NUMERIC_TYPE(vVariant->nType)) {
+      bufLen = 60;  // The maximum length of string that a number is converted to.
+    } else {
+      bufLen = vVariant->nLen + 1;
+    }
+
     if (schemaType == TSDB_DATA_TYPE_BINARY) {
-      char *tmp = calloc(1, vVariant->nLen + TSDB_NCHAR_SIZE);
+      char *tmp = calloc(1, bufLen * TSDB_NCHAR_SIZE);
       retVal = tVariantDump(vVariant, tmp, schemaType, false);
       free(tmp);
     } else if (schemaType == TSDB_DATA_TYPE_NCHAR) {
       // pRight->value.nLen + 1 is larger than the actual nchar string length
-      char *tmp = calloc(1, (vVariant->nLen + 1) * TSDB_NCHAR_SIZE);
+      char *tmp = calloc(1, bufLen * TSDB_NCHAR_SIZE);
       retVal = tVariantDump(vVariant, tmp, schemaType, false);
       free(tmp);
     } else {
@@ -4155,7 +4163,7 @@ static int32_t validateTagCondExpr(SSqlCmd* pCmd, tExprNode *p) {
     if (retVal != TSDB_CODE_SUCCESS) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
     }
-  }while (0);
+  } while (0);
 
   return TSDB_CODE_SUCCESS;
 }
diff --git a/tests/script/general/parser/topbot.sim b/tests/script/general/parser/topbot.sim
index 80a122238ec70136daa444b78764f5881563451d..e23bbf6724ea7b95a759764ac80cc2dbcdb73398 100644
--- a/tests/script/general/parser/topbot.sim
+++ b/tests/script/general/parser/topbot.sim
@@ -316,4 +316,13 @@ if $data13 != @20-02-02 01:01:01.000@ then
   return -1
 endi
 
+print ===============================>td-3361
+sql create table ttm1(ts timestamp, k int) tags(a nchar(12));
+sql create table ttm1_t1 using ttm1 tags('abcdef')
+sql insert into ttm1_t1 values(now, 1)
+sql select * from ttm1 where a=123456789012
+if $row != 0 then
+  return -1
+endi
+
 system sh/exec.sh -n dnode1 -s stop -x SIGINT
\ No newline at end of file