minor bug fix, docker

lib/conn/listener.go

@@ -43,9 +43,16 @@ func Accept(l net.Listener, f func(c net.Conn)) {
 			if strings.Contains(err.Error(), "use of closed network connection") {
 				break
 			}
+			if strings.Contains(err.Error(), "the mux has closed") {
+				break
+			}
 			logs.Warn(err)
 			continue
 		}
+		if c == nil {
+			logs.Warn("nil connection")
+			break
+		}
 		go f(c)
 	}
 }