While performing a migration from 2.4.804 - 2.5.907.x the following error is displayed in the migration logs:
Error during Migration: Cannot insert the value NULL into column 'UTCOffsetMins', table 'tpam.dbo.Users'; column does not allow nulls. INSERT fails. IN MigratePar24Tpam25 AT LINE 1126
Known issues with Migration in 2.5.907.
2.5.907 Migration of Mail Agent settings did not create SMTP.cfg which would cause "SMTP server address is missing" when trying to start the Mail Agent directly after migration. (5278)
2.5.907 Fixed problem where Migration would fail if it encountered unexpected NULL values while migrating SystemLog table (reissue from Hotfix_5188).
Verify that 2.5.907 is already installed. Download and install the following patch Hotfix_5278 and run the migration again.