Deployments stopped working with LazyInitializationException

2016-01-04 12:19:52,724 ERROR [10-BAM::PlanExec:pool-17-thread-4] [AfterSuccessfulPlanEnvironmentTriggeringAction] Error while triggering environment 
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.atlassian.bamboo.commit.CommitImpl.files, no session or session was closed
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
	at org.hibernate.collection.PersistentList.iterator(PersistentList.java:138)
	at com.atlassian.bamboo.commit.CommitImpl.guessChangeSetId(CommitImpl.java:96)
	at com.atlassian.bamboo.deployments.versions.persistence.commits.MutableDeploymentVersionVcsChangesetImpl$BuildCommit2DeploymentCommit.apply(MutableDeploymentVersionVcsChangesetImpl.java:42)
	at com.atlassian.bamboo.deployments.versions.persistence.commits.MutableDeploymentVersionVcsChangesetImpl$BuildCommit2DeploymentCommit.apply(MutableDeploymentVersionVcsChangesetImpl.java:30)
	at com.google.common.collect.Iterators$8.next(Iterators.java:812)
	at com.google.common.collect.Iterators.addAll(Iterators.java:356)
	at com.google.common.collect.Iterables.addAll(Iterables.java:332)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionChainResultDataCollectorImpl.addChangesetToMap(DeploymentVersionChainResultDataCollectorImpl.java:151)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionChainResultDataCollectorImpl.createChangesetsFromRange(DeploymentVersionChainResultDataCollectorImpl.java:133)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionChainResultDataCollectorImpl.findChangesetsAndJiraIssues(DeploymentVersionChainResultDataCollectorImpl.java:249)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionChainResultDataCollectorImpl.createChangesetsAndJiraIssues(DeploymentVersionChainResultDataCollectorImpl.java:171)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionServiceImpl.createDeploymentVersionInternal(DeploymentVersionServiceImpl.java:315)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionServiceImpl.access$000(DeploymentVersionServiceImpl.java:98)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionServiceImpl$1.apply(DeploymentVersionServiceImpl.java:264)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionServiceImpl$1.apply(DeploymentVersionServiceImpl.java:259)
	at com.atlassian.bamboo.core.ScopedExclusionServiceImpl.withLock(ScopedExclusionServiceImpl.java:75)
	at com.atlassian.bamboo.deployments.versions.service.DeploymentVersionServiceImpl.getOrCreateDeploymentVersion(DeploymentVersionServiceImpl.java:258)
	at com.atlassian.bamboo.deployments.execution.triggering.AfterSuccessfulPlanEnvironmentTriggeringAction.createDeploymentContext(AfterSuccessfulPlanEnvironmentTriggeringAction.java:113)
	at com.atlassian.bamboo.deployments.execution.service.DeploymentExecutionServiceImpl$1.call(DeploymentExecutionServiceImpl.java:239)
	at com.atlassian.bamboo.deployments.execution.service.DeploymentExecutionServiceImpl$1.call(DeploymentExecutionServiceImpl.java:233)
	at com.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:312)
	at com.atlassian.bamboo.plan.PlanExecutionLockServiceImpl.lock(PlanExecutionLockServiceImpl.java:85)
	at com.atlassian.bamboo.deployments.execution.service.DeploymentExecutionServiceImpl.execute(DeploymentExecutionServiceImpl.java:232)
	at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$5.call(PlanExecutionManagerImpl.java:637)
	at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$5.call(PlanExecutionManagerImpl.java:626)
	at com.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:312)
	at com.atlassian.bamboo.plan.PlanExecutionLockServiceImpl.lock(PlanExecutionLockServiceImpl.java:85)
	at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.doWithProcessLock(PlanExecutionManagerImpl.java:800)
	at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.startDeployment(PlanExecutionManagerImpl.java:625)
	at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.start(PlanExecutionManagerImpl.java:610)
	at com.atlassian.bamboo.plan.DelegatingPlanExecutionManager.start(DelegatingPlanExecutionManager.java:95)
	at com.atlassian.bamboo.plan.NonBlockingPlanExecutionServiceImpl$2.call(NonBlockingPlanExecutionServiceImpl.java:98)
	at com.atlassian.bamboo.plan.NonBlockingPlanExecutionServiceImpl$2.call(NonBlockingPlanExecutionServiceImpl.java:91)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at com.atlassian.bamboo.utils.BambooRunnables$1.run(BambooRunnables.java:49)
	at com.atlassian.bamboo.security.ImpersonationHelper.runWith(ImpersonationHelper.java:31)
	at com.atlassian.bamboo.security.ImpersonationHelper.runWithSystemAuthority(ImpersonationHelper.java:20)
	at com.atlassian.bamboo.security.ImpersonationHelper$1.run(ImpersonationHelper.java:52)
	at java.lang.Thread.run(Thread.java:745)