From 374a6eef7e1375ad9665a29ef384d39a0bd21a65 Mon Sep 17 00:00:00 2001
From: Juan Font Alonso <juanfontalonso@gmail.com>
Date: Sat, 15 May 2021 18:12:22 +0200
Subject: [PATCH] Fixed panic when sending keep alives to a disconnected node

---
 api.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/api.go b/api.go
index 56d858ca..3c9c0ae6 100644
--- a/api.go
+++ b/api.go
@@ -279,12 +279,14 @@ func (h *Headscale) keepAlive(cancel chan []byte, pollData chan []byte, mKey wgc
 			return
 
 		default:
+			h.pollMu.Lock()
 			data, err := h.getMapKeepAliveResponse(mKey, req, m)
 			if err != nil {
 				log.Printf("Error generating the keep alive msg: %s", err)
 				return
 			}
 			pollData <- *data
+			h.pollMu.Unlock()
 			time.Sleep(60 * time.Second)
 		}
 	}