fix nil pointer in derive

internal/app/task.go

@@ -32,7 +32,7 @@ func CrawlGo() {
 		}
 	}
 	// 节点衍生并去重
-	proxies = proxies.Derive()
+	proxies = proxies.Deduplication().Derive()
 	log.Println("CrawlGo node count:", len(proxies))
 	proxies = provider.Clash{
 		provider.Base{

pkg/proxy/proxies.go

@@ -124,6 +124,9 @@ func (ps ProxyList) Clone() ProxyList {
 func (ps ProxyList) Derive() ProxyList {
 	proxies := ps
 	for _, p := range ps {
+		if p == nil {
+			continue
+		}
 		if p.TypeName() == "ss" {
 			ssr, err := Convert2SSR(p)
 			if err == nil {