Database schema check warnings for Synchrony tables during Confluence startup

2018-04-12 21:27:38,373 WARN [AtlassianEvent::CustomizableThreadFactory-2] [persistence.schema.hibernate.HibernateSchemaComparator] lambda$compareTables$0 Schema check for table [EVENTS] encountered an error. Turn debug logging on for stacktrace.
2018-04-12 21:27:38,375 WARN [AtlassianEvent::CustomizableThreadFactory-2] [persistence.schema.hibernate.HibernateSchemaComparator] lambda$compareTables$0 Schema check for table [SECRETS] encountered an error. Turn debug logging on for stacktrace.
2018-04-12 21:27:38,377 WARN [AtlassianEvent::CustomizableThreadFactory-2] [persistence.schema.hibernate.HibernateSchemaComparator] lambda$compareTables$0 Schema check for table [SNAPSHOTS] encountered an error. Turn debug logging on for stacktrace.

2018-04-13 20:25:20,733 DEBUG [AtlassianEvent::CustomizableThreadFactory-2] [persistence.schema.hibernate.HibernateSchemaComparator] lambda$compareTables$0 
java.lang.NullPointerException
	at com.atlassian.confluence.core.persistence.schema.hibernate.HibernateSchemaComparator.compareColumns(HibernateSchemaComparator.java:115)
	at com.atlassian.confluence.core.persistence.schema.hibernate.HibernateSchemaComparator.compareTable(HibernateSchemaComparator.java:103)
	at com.atlassian.confluence.core.persistence.schema.hibernate.HibernateSchemaComparator.lambda$compareTables$0(HibernateSchemaComparator.java:84)
	at com.google.common.collect.Iterators$8.transform(Iterators.java:799)
	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
	at com.google.common.collect.Iterators$7.computeNext(Iterators.java:651)
	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
	at com.google.common.collect.Iterators.addAll(Iterators.java:361)
	at com.google.common.collect.Lists.newArrayList(Lists.java:160)
	at com.google.common.collect.Lists.newArrayList(Lists.java:144)
	at com.atlassian.confluence.core.persistence.schema.hibernate.HibernateSchemaComparator.compareTables(HibernateSchemaComparator.java:82)
	at com.atlassian.confluence.core.persistence.schema.hibernate.HibernateSchemaComparator.compareSchema(HibernateSchemaComparator.java:68)
	at com.atlassian.confluence.core.persistence.schema.hibernate.HibernateSchemaComparisonService.compareExpectedWithActualSchema(HibernateSchemaComparisonService.java:53)
	at com.atlassian.confluence.core.persistence.schema.StartupSchemaChecker.checkSchema(StartupSchemaChecker.java:63)
	at com.atlassian.confluence.core.persistence.schema.StartupSchemaChecker.checkSchemaIfBuildNumbersMatch(StartupSchemaChecker.java:52)
	at com.atlassian.tenancy.api.helper.PerTenantInitialiser.onTenantArrived(PerTenantInitialiser.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:40)
	at com.atlassian.confluence.event.ConfluenceListenerHandlersConfiguration$TimingListenerHandler$1$1.invoke(ConfluenceListenerHandlersConfiguration.java:69)
	at com.atlassian.confluence.event.ConfluenceEventDispatcher$VCacheRequestContextRunnableFactory$1.lambda$run$0(ConfluenceEventDispatcher.java:93)
	at com.atlassian.confluence.vcache.VCacheRequestContextOperations.lambda$doInRequestContext$0(VCacheRequestContextOperations.java:50)
	at com.atlassian.confluence.impl.vcache.VCacheRequestContextManager.doInRequestContextInternal(VCacheRequestContextManager.java:87)
	at com.atlassian.confluence.impl.vcache.VCacheRequestContextManager.doInRequestContext(VCacheRequestContextManager.java:71)
	at com.atlassian.confluence.vcache.VCacheRequestContextOperations.doInRequestContext(VCacheRequestContextOperations.java:49)
	at com.atlassian.confluence.event.ConfluenceEventDispatcher$VCacheRequestContextRunnableFactory$1.run(ConfluenceEventDispatcher.java:93)
	at com.atlassian.confluence.event.ConfluenceEventDispatcher$1.run(ConfluenceEventDispatcher.java:61)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"Column [buildnumber] of table [confversion] has mismatched definitions for expected [Column confversion.buildnumber int4 non-nullable] and actual [Column confversion.buildnumber int4(10) nullable]"
"Column [labelid] of table [content_label] has mismatched definitions for expected [Column content_label.labelid int8 non-nullable] and actual [Column content_label.labelid int8(19) nullable]"
"Column [cp_type] of table [content_perm] has mismatched definitions for expected [Column content_perm.cp_type varchar(10) non-nullable] and actual [Column content_perm.cp_type varchar(10) nullable]"
"Column [follower] of table [follow_connections] has mismatched definitions for expected [Column follow_connections.follower varchar(255) nullable] and actual [Column follow_connections.follower varchar(255) non-nullable]"
"Column [followee] of table [follow_connections] has mismatched definitions for expected [Column follow_connections.followee varchar(255) nullable] and actual [Column follow_connections.followee varchar(255) non-nullable]"
"Column [username] of table [logininfo] has mismatched definitions for expected [Column logininfo.username varchar(255) non-nullable] and actual [Column logininfo.username varchar(255) nullable]"
"Column [public_key_id] of table [trustedapp] has mismatched definitions for expected [Column trustedapp.public_key_id int8 non-nullable] and actual [Column trustedapp.public_key_id int8(19) nullable]"