Scenario:
If the error, ‘An unexpected SuiteScript error has occurred.’ is encountered when saving a record that has a workflow running on it, check the workflow for any Send Email action.
When adding a Send Email action on a workflow, there should always be a condition to check for both sender’s and recipient’s email address availability.
Solution:
Navigate to Customization > Workflow > Workflows > Edit existing Workflow
Click on the State that contains the Send Email workflow action
Click the Send Email action
Under the Condition section, click on the Open cross-link
Configure the Workflow Condition depending on which record field contains the email address. For example:
Click Save
Note: Do this for all Send Email actions on the workflow.