Drone crashed while landing

ArduCopter Copter 4.3
1

Hello guys,
While landing, suddenly the desired pitch raised the value.Initially the desired pitch and actual pitch were aligned, but later i have noticed the change(image added below). Observed the pitch variations while landing and the crash occured.

The log data is below for reference
https://drive.google.com/drive/folders/1nQnLnmwLVQt9OnMO5zNKcl-WqjdomnXg?usp=share_link

image
image1920×1080 276 KB

The error message is: crash disarming angerror 43>30accel 0.1<0.3

Any help will be appreciated,
Thanks

2

I think it might be a rangefinder misconfiguration, because its altitude goes to 120m at that point in time and the copter is making an attempt drop the climb rate even more. Maybe pitch diverged more than roll because part of the landing gear was already touching the ground - unsure.

3

Thank you @xfacta for looking into.
I will check the rangefinder as you metioned.