From ee368e15f84ca44619dd3ead639ebe7d1610eb9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vicent=20Mart=C3=AD?= <42793+vmg@users.noreply.github.com>
Date: Tue, 30 Jan 2024 14:47:41 +0100
Subject: [PATCH] discovery: fix crash with nil server vschema (#15086)

---
 go/vt/discovery/keyspace_events.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/go/vt/discovery/keyspace_events.go b/go/vt/discovery/keyspace_events.go
index 163f240de8c..c2567da9a87 100644
--- a/go/vt/discovery/keyspace_events.go
+++ b/go/vt/discovery/keyspace_events.go
@@ -529,6 +529,11 @@ func (kss *keyspaceState) isServing() bool {
 // In addition, the traffic switcher updates SrvVSchema when the DeniedTables attributes in a Shard record is
 // modified.
 func (kss *keyspaceState) onSrvVSchema(vs *vschemapb.SrvVSchema, err error) bool {
+	// the vschema can be nil if the server is currently shutting down
+	if vs == nil {
+		return true
+	}
+
 	kss.mu.Lock()
 	defer kss.mu.Unlock()
 	kss.moveTablesState, _ = kss.getMoveTablesStatus(vs)