server: guard against nil KnownPacks in ServeConfig

2026-07-31 15:49:05 +02:00
parent 8bd54a04f2
commit 33754d7c71
1 changed files with 9 additions and 7 deletions
@@ -27,7 +27,8 @@ func ServeConfig(c *proto.Conn) (err error) {
 	}
 	cs.registryData = n.Value.(map[string]any)
 	packet := &v1_21_8.ConfigurationToClientPacketCommonSelectKnownPacks{}
-	for _, pAny := range cs.registryData["KnownPacks"].([]any) {
+	if knownPacks, ok := cs.registryData["KnownPacks"]; ok {
+		for _, pAny := range knownPacks.([]any) {
 			p := pAny.(map[string]any)
 			packet.Packs = append(packet.Packs, struct {
 				Namespace string
@@ -35,6 +36,7 @@ func ServeConfig(c *proto.Conn) (err error) {
 				Version   string
 			}{p["Namespace"].(string), p["Id"].(string), p["Version"].(string)})
 		}
+	}
 	err = c.Send(packet)
 	if err != nil {
 		return