Hi, I have the latest SourceTree for Windows (version 3.4.8) and using Git standalone version 2.35.1.windows.2. I am using Windows OpenSSH for authentication. SourceTree gives the following error: This happens: * - every time SourceTree is opened * - every time I close the Tools -> Options window * - every time Tools -> Launch SSH agent... is clicked Any idea on how to solve this? PS: Here is my git configuration on SourceTree Options: Update (2022-06-01): this still happens with SourceTree version 3.4.9 Update (2022-10-19): this still happens with SourceTree version 3.4.10. This is frustrating! Time to change git GUI... Update (2023-09-28): this still happens with SourceTree version 3.4.15.

this worked for me: (This solution is based on Dan Worleys answer on the thread "SourceTree unusable on startup ('ssh-agent' failed with code -1: System.NullReferenceException)" in some Jira ticket I found online) https://jira.atlassian.com/browse/SRCTREEWIN-8375 * Uninstall SourceTree from `Add or remove programs` * Delete the following:* C:\Users\ \AppData\Local and delete SourceTree & SourceTree-Settings folder * C:\Users\ \AppData\Local\Atlassian and delete all SourceTree Files/Folder. * Reinstall SourceTree Deleting all atlassian appdata files seems to help for multiple problems. I remember an error where I couldn't start up Sourcetree anymore. The splashscreen showed up and disappeared again without starting sourcetree itself. For that bug the solution was the same: delete all AppData files for sourcetree. Hope this helps for any poor soul in the future trying to find a solution, cheers :)

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Error 'ssh-agent' failed with code -1: System.NullReferenceException

Vittorio Sozzi

Hi, I have the latest SourceTree for Windows (version 3.4.8) and using Git standalone version 2.35.1.windows.2. I am using Windows OpenSSH for authentication.

SourceTree gives the following error: Immagine 2022-03-07 122703.png

This happens:

- every time SourceTree is opened
- every time I close the Tools -> Options window
- every time Tools -> Launch SSH agent... is clicked

Any idea on how to solve this?

PS: Here is my git configuration on SourceTree Options: Immagine 2022-03-07 123222.png

Update (2022-06-01): this still happens with SourceTree version 3.4.9

Update (2022-10-19): this still happens with SourceTree version 3.4.10. This is frustrating! Time to change git GUI...

Update (2023-09-28): this still happens with SourceTree version 3.4.15.

Accepted answers

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Vittorio Sozzi

this still happens with SourceTree version 3.4.10. This is frustrating! Time to change git GUI...

Gonzalo Piffaretti

I have the same issue. Everything works as expected when using git in bash or powershell. Sourcetree is just not playing nicely with OpenSSH.
Also evaluating a change.

Vittorio Sozzi

I opened an issue in SourceTree for Windows Jira https://jira.atlassian.com/browse/SRCTREEWIN-14297

If you feel like it, you can vote/comment it.

I don't have much faith that it will be considered or even corrected but at least I reported it.

Niko Frenkenberger

this worked for me:

(This solution is based on Dan Worleys answer on the thread
"SourceTree unusable on startup ('ssh-agent' failed with code -1: System.NullReferenceException)" in some Jira ticket I found online)
https://jira.atlassian.com/browse/SRCTREEWIN-8375

Uninstall SourceTree from `Add or remove programs`
Delete the following:
- C:\Users\<UserName>\AppData\Local and delete SourceTree & SourceTree-Settings folder
- C:\Users\<UserName>\AppData\Local\Atlassian and delete all SourceTree Files/Folder.
Reinstall SourceTree

Deleting all atlassian appdata files seems to help for multiple problems. I remember an error where I couldn't start up Sourcetree anymore. The splashscreen showed up and disappeared again without starting sourcetree itself. For that bug the solution was the same: delete all AppData files for sourcetree.

Hope this helps for any poor soul in the future trying to find a solution, cheers

Joke Huang

3.4.24 still.

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