Exception when logging work

Description

Since today, whenever we try to log work, the exception is received.
Updating for 2.13.2 to 2.13.3 did not help.
I reindexed Jira and ran the Integrity Checker that did not find issues.
Any idea?

Note: I had previously disabled Jira's worklog via instructions on your Knowledgebase:
"Disabling JIRA's Own Work Log Related Functions". Suspecting this may be related (mainly because it was the only change performed on the system for a while) I reenabled all plugins. This did not solve the issue though.

Technical details
Log's referral number: 6c542b37-dc11-4363-9473-b320b8b36cc1
Cause
Referer URL: http://aeroteldc:8080/secure/WPShowTimesheetAction!monthlyUserTimesheet.jspa
java.lang.RuntimeException: Custom field 'Epic Link' with ID '10001' exists in DB, but was not returned by the custom field service.
java.lang.RuntimeException: Custom field 'Epic Link' with ID '10001' exists in DB, but was not returned by the custom field service.
at com.atlassian.greenhopper.service.issuelink.EpicCustomFieldServiceImpl.getDefaultFieldOrNull(EpicCustomFieldServiceImpl.java:211) [?:?]
at com.atlassian.greenhopper.service.issuelink.EpicCustomFieldServiceImpl.getDefaultField(EpicCustomFieldServiceImpl.java:180) [?:?]
at com.atlassian.greenhopper.service.issuelink.EpicCustomFieldServiceImpl.getDefaultEpicLinkField(EpicCustomFieldServiceImpl.java:95) [?:?]
at com.atlassian.greenhopper.api.customfield.ManagedCustomFieldsServiceImpl.getEpicLinkCustomField(ManagedCustomFieldsServiceImpl.java:48) [?:?]
at com.deniz.jira.worklog.services.gh.ManagedCustomFieldsServiceHolder.a(SourceFile:22) [?:?]
at com.deniz.jira.worklog.action.CreateWorklogOnIssueWithWorkLogAction.getEpic(SourceFile:443) [?:?]
at com.deniz.jira.worklog.action.CreateWorklogOnIssueWithWorkLogAction.addResultToResponse(SourceFile:384) [?:?]
at com.deniz.jira.worklog.action.CreateWorklogOnIssueWithWorkLogAction.doExecute(SourceFile:288) [?:?]
at webwork.action.ActionSupport.execute(ActionSupport.java:165) [webwork-1.4-atlassian-30.jar:?]
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:63) [jira-api-7.3.2.jar:?]
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39) [webwork-1.4-atlassian-30.jar:?]
at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31) [webwork-1.4-atlassian-30.jar:?]
at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16) [webwork-1.4-atlassian-30.jar:?]
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35) [webwork-1.4-atlassian-30.jar:?]
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:225) [webwork-1.4-atlassian-30.jar:?]
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:154) [webwork-1.4-atlassian-30.jar:?]
at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:147) [classes/:?]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) [catalina.jar:8.5.6]
at
There is much more. Jira did not allow copying the whole test because of size limitations.

Environment

JIRA Software 7.3.2 on our server

Priority

Major

Assignee

Deniz Oğuz

Reporter

Michael Kaz

Affects versions

Fix versions

Labels

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Source

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Jira Version

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Database Type/Version

None

Browser Type/Version

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