diff --git a/server/conn.go b/server/conn.go
index 9bf513cdbf495..11576da333425 100644
--- a/server/conn.go
+++ b/server/conn.go
@@ -669,6 +669,8 @@ func (cc *clientConn) Run(ctx context.Context) {
 				zap.String("err", fmt.Sprintf("%v", r)),
 				zap.String("stack", string(buf)),
 			)
+			err := cc.writeError(errors.New(fmt.Sprintf("%v", r)))
+			terror.Log(err)
 			metrics.PanicCounter.WithLabelValues(metrics.LabelSession).Inc()
 		}
 		if atomic.LoadInt32(&cc.status) != connStatusShutdown {