WordPress database error

Hi, it seems like there’s a limit to the number of fields that can be added to the registration form. Our form has 81 fields, when trying to add any additional fields this error pops up:

WordPress database error: [Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs]