diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index fe5374d5da..cf0dd9ecdb 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -1273,7 +1273,7 @@ static int32_t tGetTagVal(uint8_t *p, STagVal *pTagVal, int8_t isJson) {
     n += tGetCStr(p + n, &pTagVal->pKey);
   } else {
     n += tGetI16v(p + n, &pTagVal->cid);
-    ASSERTS(pTagVal->cid < 0, "Invalid tag cid:%" PRIi16, pTagVal->cid);
+    ASSERTS(pTagVal->cid > 0, "Invalid tag cid:%" PRIi16, pTagVal->cid);
   }
 
   // type