diff --git a/pool/tree/pool.go b/pool/tree/pool.go
index ddfdc0ef..b77d63a8 100644
--- a/pool/tree/pool.go
+++ b/pool/tree/pool.go
@@ -1009,8 +1009,10 @@ func (p *Pool) addClientToMap(hash uint64, cl client) {
 
 func (p *Pool) deleteClientFromMap(hash uint64) {
 	p.mutex.Lock()
-	_ = p.clientMap[hash].close()
-	delete(p.clientMap, hash)
+	if cli, ok := p.clientMap[hash]; ok {
+		_ = cli.close()
+		delete(p.clientMap, hash)
+	}
 	p.mutex.Unlock()
 }