Frequent TGitCache crashes using php ./composer update

I can consistently crash tgitcache (win7 x64) by executing a large ./composer update.

What steps will reproduce the problem?

See https://github.com/rtek/tgitcrash

What is the expected output? What do you see instead?

tgitcache crashes like this

1. https://drdump.com/UploadedReport.aspx?DumpID=22137378
2. https://drdump.com/UploadedReport.aspx?DumpID=22137527
3. https://drdump.com/UploadedReport.aspx?DumpID=22137542

What version of TortoiseGit and Git are you using? On what operating system?

v2.6.0 / win7 x64

Please provide any additional information below.

What is the best way to collect data on this situation?