"listener name is null" while initializing FolderTreePlugin

While logging into CMS I get

29.09.2009 15:35:32 ERROR [org.hippoecm.frontend.plugin.impl.PluginContext.registerTracker():186] listener name is null
29.09.2009 15:35:32 ERROR [org.hippoecm.frontend.plugin.impl.PluginManager.registerTracker():176] listener name is null
29.09.2009 15:36:15 ERROR [org.hippoecm.frontend.plugin.impl.PluginContext.registerTracker():186] listener name is null

After a bit of debugging these messages are displayed while the FolderTreePlugin being initialized.

CMS seems to be working fine, if this doesn't have any side effects, it would be better to change the message to log.debug/warn instead of error.