Cannot read property 'originalEstimate' of undefined
This error is shown when the estimation statistic of the agile board is set to Original Estimate / Original Time Estimate and the Time Tracking fields are hidden on the Field Configuration.
To fix this find the Field Configuration for the project on the agile board and select 'Show':
For more on this see this JIRA Knowledge Base article: Cannot read property 'text' of undefined.
If this does not solve your issue, please reach out to our Customer Support Team and we will be happy to help!