When i click 'Create Pull Request' on a branch of a Bitbucket Git repository, it gives a warning about remote project configuration.

It states that I don't have any remotes configured which have extended integration settings configured.

But, if I open settings, the Bitbucket remote is configured as should be (default remote: origin). 

Removing the remote and re-adding it as default remote by entering the URL in remote settings again solves the issue. But after restarting sourcetree the error appears again en can only be resolved by removing and re-adding the remote again.