check stats exists before callback stat within newResult

Author: rekby

CHANGELOG.md

@@ -1,3 +1,5 @@
+* Fixed sometime panic on stats receive in query service
+
 ## v3.99.7
 * Fixed not passing request context to topic event logs
 * Fixed deadlock on closing table session with internal query session core

internal/query/result.go

@@ -169,7 +169,7 @@ func newResult(
 
 		r.lastPart = part
 
-		if r.statsCallback != nil {
+		if part.GetExecStats() != nil && r.statsCallback != nil {
 			r.statsCallback(stats.FromQueryStats(part.GetExecStats()))
 		}