From 8fa281fa5bac4ca0c7c8117289558bc6132844f2 Mon Sep 17 00:00:00 2001
From: Dmitri Ranfft <ranfft.dmitri@gmail.com>
Date: Fri, 4 May 2018 17:42:52 +0200
Subject: [PATCH] RangeFinder: fixed a crash when VL53L0X was enabled in the
 software but not connected.

---
 libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.cpp b/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.cpp
index f76bbd8c9f..e1dc09f4f9 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.cpp
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.cpp
@@ -228,6 +228,9 @@ AP_RangeFinder_VL53L0X::AP_RangeFinder_VL53L0X(RangeFinder::RangeFinder_State &_
 */
 AP_RangeFinder_Backend *AP_RangeFinder_VL53L0X::detect(RangeFinder::RangeFinder_State &_state, AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev)
 {
+	if(!dev){
+		return nullptr;
+	}
     AP_RangeFinder_VL53L0X *sensor
         = new AP_RangeFinder_VL53L0X(_state, std::move(dev));