Error on the OnStart of App

[consultantlk]

Hi Everyone, We have an app that has been pushed to PROD and have been in use for a while. There are some users that have been using the app for a while but all of a sudden some of them started get the following error when they opened the app:

[prefix]_last_name: Field '[prefix]_last_name' is required

The OnStart property of the app is coded to see if the current user exists in the our custom user table, if they don't, then a patch is done to add the individual in. But these people have used the app many times and a patch is not required. 

We have tried using a different browser in incognito mode and it works a few times and then starts giving that error again. Has anyone experienced this before?

[CNT]

@consultantlk We've had some issues with OnStart recently. Could you share the full code?