om.atlassian.cache.CacheException: java.lang.NullPointerException: Null keys are not supported

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om.atlassian.cache.CacheException: java.lang.NullPointerException: Null keys are not supported
at com.atlassian.cache.memory.DelegatingCache.rejectNullKey(DelegatingCache.java:435)
at com.atlassian.cache.memory.DelegatingCache.get(DelegatingCache.java:138)
at com.atlassian.jira.issue.managers.DefaultCustomFieldManager.getCustomFieldObjectsByName(DefaultCustomFieldManager.java:394)
at com.atlassian.jira.issue.managers.DefaultCustomFieldManager.getCustomFieldObjectByName(DefaultCustomFieldManager.java:374)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

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