Issue upgrading from SMF 2.0 to MyBB 1.8.37

[StarredSkies]

I am upgrading from SMF 2.0 and this appears to be an issue with MyBB 1.8.37. This appeared to be an issue previously but it has come back up.

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1054 - Unknown column 'id_msg' in 'where clause'

SQL Error:
1054 - Unknown column 'a.id_attach' in 'field list'

SQL Error:
1054 - Unknown column 'variable' in 'where clause'

See thread on MyBB community.

How was this resolved in previous versions? I would like to fix this.