Could you let us know if the crashing occurs when playing online?
We do not enforce any building limits, but we do advise that you keep a low number of light sources and try to not go overboard with placeables and NPCs, if possible, as crashes are in many cases caused by high amounts of placeables in the same area, since the single-player client is unable to handle the same load as the online client, especially on console.
Additionally, could you try to rebuild the PS4 database?