title: fatal: bad boolean config value 'null' for 'commit.gpgsign' gitkraken and gitclients
body: <p>I am using <code>GitKraken</code> as my git client and it was always working fine, but for a few days I am getting the error <code>fatal: bad boolean config value 'null' for 'commit.gpgsign'</code> when I use any other git clients. I have tried <code>cmd</code>, <code>vscode</code>, <code>PowerShell</code> in <code>vscode</code> and <code>Git GUI</code>. I have also uninstalled the <code>GitKraken</code> and try, but I guess it somehow retains the settings. Have you ever experienced this issue?</p>