Javascript (with React tools) console error "fullOrigValue.slice is not a function" in MessageTableEntry.jsx

[epitomus]

Problem description

Javascript (with React tools) console error "fullOrigValue.slice is not a function" when trying to add extra fields to the Messages display. See image here from the React tools :

Steps to reproduce the problem

1. Go to search tab and enter a term that ensures there will be content in the messages panel
2. Click to add an additional field to display from the Fields panel
3. Notice the field does not get added to the Messages panel (although the existing fields do get moved around)

Environment

• Graylog Version: 2.0.0-3.beta.2
• Elasticsearch Version: 2.3.1
• MongoDB Version: 3.2.4
• Operating System: Ubuntu 15.10
• Browser version: Chrome 48.0.2564.116 (64-bit)

Note: I realised my chrome version was out of date, so upgraded to 49.0.2623.110 and the problem persists.