From bdfb2bbb8d3655c84dc95702a4948a25e63bc750 Mon Sep 17 00:00:00 2001
From: David Sidrane <david_s5@nscdg.com>
Date: Fri, 21 Oct 2016 15:59:34 -1000
Subject: [PATCH] Fixed hardfault on fast proc

_baro_topic can be null in init sequence
   init call collect before the topic is inited.

I think this pattern is repeated in other drivers. I would suggest
allowing null in orb_publish to just return.
---
 src/drivers/ms5611/ms5611.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/drivers/ms5611/ms5611.cpp b/src/drivers/ms5611/ms5611.cpp
index 43d10ecf5c..08ac9fab0b 100644
--- a/src/drivers/ms5611/ms5611.cpp
+++ b/src/drivers/ms5611/ms5611.cpp
@@ -800,7 +800,7 @@ MS5611::collect()
 		report.altitude = (((pow((p / p1), (-(a * R) / g))) * T1) - T1) / a;
 
 		/* publish it */
-		if (!(_pub_blocked)) {
+		if (!(_pub_blocked) && _baro_topic != nullptr) {
 			/* publish it */
 			orb_publish(ORB_ID(sensor_baro), _baro_topic, &report);
 		}