Bug can occurs in Make if a field is empty.
The workaround is to create a folk module for all cases. For exemple create a folk update if email+ phone number and another one if only an email. To do so:
Create a Router
Add filters to check if fields are empty
Create multiple Make module for folk (one for each scenario)
Send data to the corresponding module
Bug can occurs on Zapier when a contact have been deleted
Using Zapier you can test your workflows with past data from folk.
People and companies might have been send to Zapier before deleting them. Therefore, steps to find them won’t work as these people/ companies do not exist anymore.
To troubleshoot it you need to make the scenario live after setting up the trigger. And fire an action to trigger it. By doing so you’ll get up to date data.