How to fix SourceTree error ‘ssh-agent’ failed with code -1

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I recently encountered a strange error when upgrading from SourceTree 1.7 to SourceTree 1.8 on Windows 8.

The error was as follows:

'ssh-agent' failed with code -1: System.NullReferenceException: Object reference not set to an instance of an object.

An error dialog like this would always pop up whenever SourceTree 1.8 started or whenever I attempt to update OpenSSH settings.

sourcetree1.8-upgrade-ssh-error

If you are seeing this error, there is a good chance are that your ‘git for Windows’ is out of date. Installing the latest ‘git for Windows” which in my case was version 2.7.1(2) resolved the error.

I downloaded it from this site: https://git-for-windows.github.io/

Hope this helps.

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