ArduPilot / ArduPilot/MissionPlanner

Log download via mavlink failing with "Error in log Object reference not set.."

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Dominant language
C#
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Description

I'm having troubles downloading logs from Rover-3.5.0-dev but I've seen it on other vehicles types as well.

![mp-log-download-fail](https://user-images.githubusercontent.com/1498098/47765091-9f317f00-dd0b-11e8-9d7b-e0d95c86624a.png)

I'm using a very recent version of beta MP
![mp-log-download-fail-mp-ver](https://user-images.githubusercontent.com/1498098/47765097-b3757c00-dd0b-11e8-80ef-15b6e59fcc1b.png)

Contributor guide

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Research direction

Start by reproducing the log download failure in Mission Planner with Rover 3.5.0-dev and the recent beta version described in the issue. Trace the MAVLink log-download path from the reported “Error in log Object reference not set..” message; done means logs download without that error across the affected vehicle types.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
desktop-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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