Server logs being filled up by wiki syntax errors

Server logs are being filled up with wiki syntax errors like:
BR.recoverFromMismatchedToken
line 13:15 mismatched input '\n' expecting NOWIKI_CLOSE
BR.recoverFromMismatchedToken
line 28:3 mismatched input '\n' expecting NOWIKI_CLOSE
BR.recoverFromMismatchedToken
line 47:15 mismatched input '\n' expecting NOWIKI_CLOSE
BR.recoverFromMismatchedToken
line 63:3 mismatched input '\n' expecting NOWIKI_CLOSE
line 811:46 no viable alternative at input '\n'
line 816:21 no viable alternative at input '\n'
line 825:14 no viable alternative at input '\n'
line 837:50 no viable alternative at input '\n'

1. Go to control panel > wiki
2. Add a page, choose format creole, click source and use this content

{{{##
##
#test
}}}

3. Click save

It should return a stack trace similar to this:

BR.recoverFromMismatchedToken
line 1:5 mismatched input '\n' expecting NOWIKI_CLOSE
BR.recoverFromMismatchedToken
line 1:5 mismatched input '\n' expecting NOWIKI_CLOSE
02:03:38,886 ERROR [http-8081-3][render_portlet_jsp:154] java.util.EmptyStackException
at com.liferay.portal.parsers.creole.parser.Creole10Parser.list_elems(Creole10Parser.java:5650)
at com.liferay.portal.parsers.creole.parser.Creole10Parser.list(Creole10Parser.java:5510)
at com.liferay.portal.parsers.creole.parser.Creole10Parser.paragraph(Creole10Parser.java:752)
at com.liferay.portal.parsers.creole.parser.Creole10Parser.paragraphs(Creole10Parser.java:244)
at com.liferay.portal.parsers.creole.parser.Creole10Parser.wikipage(Creole10Parser.java:194)
at com.liferay.portlet.wiki.engines.antlrwiki.CreoleWikiEngine.parse(CreoleWikiEngine.java:122)
at com.liferay.portlet.wiki.engines.antlrwiki.CreoleWikiEngine.convert(CreoleWikiEngine.java:55)
at com.liferay.portlet.wiki.util.WikiUtil._convert(WikiUtil.java:489)
at com.liferay.portlet.wiki.util.WikiUtil.convert(WikiUtil.java:87)
at com.liferay.portlet.wiki.service.impl.WikiPageLocalServiceImpl.notifySubscribers(WikiPageLocalServiceImpl.java:1800)
at com.liferay.portlet.wiki.service.impl.WikiPageLocalServiceImpl.updateStatus(WikiPageLocalServiceImpl.java:1561)
at com.liferay.portlet.wiki.service.impl.WikiPageLocalServiceImpl.updateStatus(WikiPageLocalServiceImpl.java:1656)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:122)
at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:71)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:118)
at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:162)
at com.liferay.portlet.wiki.service.WikiPageLocalServiceUtil.updateStatus(WikiPageLocalServiceUtil.java:817)
at com.liferay.portlet.wiki.workflow.WikiPageWorkflowHandler.updateStatus(WikiPageWorkflowHandler.java:64)
at com.liferay.portlet.wiki.workflow.WikiPageWorkflowHandler.updateStatus(WikiPageWorkflowHandler.java:1)
at com.liferay.portal.kernel.workflow.WorkflowHandlerRegistryUtil.startWorkflowInstance(WorkflowHandlerRegistryUtil.java:143)