release:rollback fails after branch with NPE and complaint about missing scm URL

[INFO] Trace
java.lang.NullPointerException: The scm url cannot be null.
	at org.apache.maven.scm.manager.AbstractScmManager.makeScmRepository(AbstractScmManager.java:181)
	at org.apache.maven.shared.release.scm.DefaultScmRepositoryConfigurator.getConfiguredRepository(DefaultScmRepositoryConfigurator.java:62)
	at org.apache.maven.shared.release.phase.RestoreBackupPomsPhase.restorePomBackup(RestoreBackupPomsPhase.java:100)
	at org.apache.maven.shared.release.phase.RestoreBackupPomsPhase.execute(RestoreBackupPomsPhase.java:69)
	at org.apache.maven.shared.release.DefaultReleaseManager.rollback(DefaultReleaseManager.java:250)
	at org.apache.maven.shared.release.DefaultReleaseManager.rollback(DefaultReleaseManager.java:227)
	at org.apache.maven.plugins.release.RollbackReleaseMojo.execute(RollbackReleaseMojo.java:54)
	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:483)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:678)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:553)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:523)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:371)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:268)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:181)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
	at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
	at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] ------------------------------------------------------------------------