Maven release works sucessfully, failure on delete-tag

[TrueDub]

On executing the task, the upload to Nexus works perfectly, as does the version change in package.json.

However the task then fails when trying to delete the tag with the new version from Git - it doesn't exist, and I'm not sure why it should. Am I doing something wrong? Or is there a way to prevent the tag deletion step? I could force it through, although I'd prefer not to.

My (sanitised) config from Gruntfile.js:

maven: {
            options: {
                groupId: 'com.jim.fred',
                repositoryId: 'nexus',
                gitpush: false,
                gitpushtag: false
            },
            deploy: {
                options: {
                    goal: 'release',
                    url: 'http://user:pwd@nexusmachine.int/content/repositories/releases',
                    mode: 'patch',
                    destFolder: 'jimbo',
                },
                files: [
                    {
                        expand: true,
                        cwd: 'build/',
                        src: ['**']
                    }
                ]
            }
        }