Win7 Tester (build97-b1) is failing on the update scripts step with the following error:

Full logs at https://build.chromium.org/p/chromium.webrtc/builders/Win7%20Tester/builds/37734/steps/update_scripts/logs/stdio

build/scripts/gsd_generate_index (ERROR)
----------------------------------------
[0:00:04] Started.
_____ build\scripts\gsd_generate_index at refs/remotes/origin/master
----------------------------------------
Error: Command 'git remote --verbose update' returned non-zero exit status 1 in C:\b\build\scripts\gsd_generate_index
error: bad signature
fatal: index file corrupt