After upgrading from version 0.0.8 to 0.0.9 of this plugin, the Jenkins UI fails to load upon restart. The "Jenkins" service is running but serves no content to browsers. The error log shows the following stack trace:

Dec 17, 2015 7:59:54 AM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed Loading plugin scm-sync-configuration
java.io.IOException: Failed to initialize
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:441)
at hudson.PluginManager$2$1$1.run(PluginManager.java:371)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:905)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(Unknown Source)
at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(Unknown Source)
at java.lang.reflect.Field.get(Unknown Source)
at hudson.plugins.scm_sync_configuration.scms.ScmSyncSubversionSCM.extractScmCredentials(ScmSyncSubversionSCM.java:59)
at hudson.plugins.scm_sync_configuration.scms.SCM.getConfiguredRepository(SCM.java:66)
at hudson.plugins.scm_sync_configuration.SCMManipulator.scmConfigurationSettledUp(SCMManipulator.java:57)
at hudson.plugins.scm_sync_configuration.ScmSyncConfigurationBusiness.initializeRepository(ScmSyncConfigurationBusiness.java:72)
at hudson.plugins.scm_sync_configuration.ScmSyncConfigurationBusiness.init(ScmSyncConfigurationBusiness.java:67)
at hudson.plugins.scm_sync_configuration.ScmSyncConfigurationPlugin.initialInit(ScmSyncConfigurationPlugin.java:174)
at hudson.plugins.scm_sync_configuration.ScmSyncConfigurationPlugin.start(ScmSyncConfigurationPlugin.java:157)
at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:449)
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:438)
... 9 more

Manually downgrading the scm-sync-configuration plugin to 0.0.8 and restarting solves the problem. I've done this upgrade/downgrade cycle twice to confirm that this is indeed the cause.