There are some opinions. Using creative button you can change your gamemode and add any thing that you want(for example you can take string to leave a trail or you can develop systems) İf you want, you can summon some monster into the maze. At last, if you want new maze you should reset it first.
If this warning came, it means there is exit. But if this warning did not come despite systems stopped( it happens rare), There is no exit(this bug became because maze be created randomly)