After upgrading Jira Version the Epic Links dropdown displays an Error
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
An Error message is displayed after selecting the Epic Link dropdown.

Environment
This may occur after Jira is upgraded.
Diagnosis
On the UI only the message "Error:" is displayed.
In the Jira logs the error stack trace below is displayed:
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2024-01-23 14:21:07,676+0100 http-nio-8080-exec-16 ERROR User.Name 861x837754x1 1a2a3a 1.1.1.1,0:0:0:0:0:0:0:1 /rest/greenhopper/1.0/epics [c.a.p.r.c.error.jersey.ThrowableExceptionMapper] Uncaught exception thrown by REST service: null
java.lang.NullPointerException
at com.atlassian.jira.issue.DocumentIssueImpl.getProject(DocumentIssueImpl.java:64)
at com.atlassian.jira.issue.DocumentIssueImpl.getProjectObject(DocumentIssueImpl.java:69)
at com.quisapps.jira.fieldsecurity.scheme.impl.FieldSecurityManagerImpl._getFieldAccess(FieldSecurityManagerImpl.java:266)
at com.quisapps.jira.fieldsecurity.scheme.impl.FieldSecurityManagerImpl.getFieldAccess(FieldSecurityManagerImpl.java:249)
at com.quisapps.jira.fieldsecurity.scheme.impl.FieldSecurityManagerImpl.getFieldAccess(FieldSecurityManagerImpl.java:239)
at com.quisapps.jira.fieldsecurity.issue.SecureIssueImpl.getCustomFieldValue(SecureIssueImpl.java:180)
at com.quisapps.jira.fieldsecurity.issue.SecureDocumentIssueImpl.getCustomFieldValue(SecureDocumentIssueImpl.java:272)
at com.atlassian.greenhopper.customfield.epiclabel.EpicLabelProviderImpl.getEpicLabel(EpicLabelProviderImpl.java:26)
at com.atlassian.greenhopper.service.issuelink.EpicPickerServiceImpl.lambda$createEpicNamesResult$0(EpicPickerServiceImpl.java:305)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
...
Cause
We can see the classes below in the error, that belong to: Field Security for Jira
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at com.quisapps.jira.fieldsecurity.scheme.impl.FieldSecurityManagerImpl._getFieldAccess(FieldSecurityManagerImpl.java:266)
at com.quisapps.jira.fieldsecurity.scheme.impl.FieldSecurityManagerImpl.getFieldAccess(FieldSecurityManagerImpl.java:249)
at com.quisapps.jira.fieldsecurity.scheme.impl.FieldSecurityManagerImpl.getFieldAccess(FieldSecurityManagerImpl.java:239)
at com.quisapps.jira.fieldsecurity.issue.SecureIssueImpl.getCustomFieldValue(SecureIssueImpl.java:180)
at com.quisapps.jira.fieldsecurity.issue.SecureDocumentIssueImpl.getCustomFieldValue(SecureDocumentIssueImpl.java:272)
Solution
Disabling the Field Security for Jira app would cause the error message to not occur anymore.
Depending on the "Field Security for Jira" version installed it would also be possible to upgrade it to the latest compatible version.
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