Log window crash with "Include merge revisions" enabled

Roughly for the last month we've been experiencing crashes when enable "Include merged revision" toggle in Log window. Very rarely it works, once out of 100.

Until today I was getting "Want to go offline?" pop-up after enabling the toggle and then when chose "Offline for now" Tortoise crashed. Now I don't even get the popup, it just crashes after enabling the toggle.

I'm on Windows 10, using latest Tortoise version 1.9.3, Build 27038 - 64 Bit. I tried to 1.9.2, 1.9.0, 1.8.12 and 1.8.9 checking out fresh working copy but the issue persisted.

The crash dump reported as problem 178720 on Doctor Dump
https://drdump.com/Problem.aspx?ProblemID=176720

It seems there is something that the Tortoise doesn't like about our particular repository. There are 2 companies collaborating on it. Other developers in our company (A) could reproduce the issue, but developers in other company (B) could not. The developer at company B, tested using TortoiseSVN 1.8.8.

I tried testing with another test repository hosted on assembla.com and for that one I could toggle and view merged revisions as expected.

Any idea what could be wrong? When that could be fixed?
What can I do to help debug the issue? I'm pretty sure it won't be possible to give any 3rd party access to the repository to debug this.

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