From 2610d4b1e4ee43c490bd33bfcaa8f62057af84be Mon Sep 17 00:00:00 2001
From: Simone Margaritelli <evilsocket@gmail.com>
Date: Fri, 8 Jan 2021 23:45:08 +0100
Subject: [PATCH] fix: do not close serial port if nil (fixes #805)

---
 modules/gps/gps.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/gps/gps.go b/modules/gps/gps.go
index a1bea9c8..542b5375 100644
--- a/modules/gps/gps.go
+++ b/modules/gps/gps.go
@@ -191,11 +191,11 @@ func (mod *GPS) Start() error {
 	}
 
 	return mod.SetRunning(true, func() {
-		defer mod.serial.Close()
-
 		mod.Info("started on port %s ...", mod.serialPort)
 
 		if mod.serial != nil {
+			defer mod.serial.Close()
+
 			for mod.Running() {
 				mod.readFromSerial()
 			}