Uncaught Uknown exception when click "Where is my field?" link in Create Epic Screen

When creating an issue via the 'create epic' link on an Scrum board and then go to 'configure fields -> wheres my field' you get the "Exception: Uncaught Uknown current dialog ID: create-epic-dialog" error.

When using the CREATE blue button at the top of the toolbar and look for a field this doesn't occur.

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Details
Exception: Uncaught Uknown current dialog ID: create-epic-issue-dialog
Resource: http://jira:8080/s/4656d50aa2f9cdc7697473cbc03014b9-CDN/en_GB-v04em/70120/b6b48b2829824b869586ac216d119363/6af66484f7deebc729bda9e971fa2f42/_/download/contextbatch/js/greenhopper-rapid-non-gadget,gh-rapid,jira.project.sidebar,atl.general,atl.global,jira.global,jira.general,-_super/batch.js?agile_global_admin_condition=true&jag=true&jaguser=true&locale=en-GB
Line: 11889
Column: 1199
Environment
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.103 Safari/537.36