java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$EntryIterator.next(HashMap.java:1463)
at org.eclipse.smarthome.core.thing.xml.internal.XmlChannelTypeProvider.removeCachedChannelTypes(XmlChannelTypeProvider.java:382)
at org.eclipse.smarthome.core.thing.xml.internal.XmlChannelTypeProvider.addChannelType(XmlChannelTypeProvider.java:130)
at org.eclipse.smarthome.core.thing.xml.internal.ThingTypeXmlProvider.addingFinished(ThingTypeXmlProvider.java:135)
at org.eclipse.smarthome.config.xml.osgi.XmlDocumentBundleTracker.addingFinished(XmlDocumentBundleTracker.java:220)
at org.eclipse.smarthome.config.xml.osgi.XmlDocumentBundleTracker.access$6(XmlDocumentBundleTracker.java:215)
at org.eclipse.smarthome.config.xml.osgi.XmlDocumentBundleTracker$1.processBundle(XmlDocumentBundleTracker.java:141)
at org.eclipse.smarthome.config.xml.osgi.AbstractAsyncBundleProcessor$1.run(AbstractAsyncBundleProcessor.java:231)
at java.lang.Thread.run(Thread.java:744)

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