After one of the animatronics accidentally stayed behind in the portal.. it closed and the portal was broken. The time within the portal moves way slower than back in the normal world.

Four years later Brian opened up a new place, FreddyLand. Which is built on the same complex as it burned down with all the animatronics inside.

But then.. the portal opened up on the ground inside Brian his office. His eyes widened.

"What-? H-How... it's been broken for years.."