done building tile_map...5453541
done level constructor: 60
SET STARTING CYCLES: 0
PLAY: 0x7f3e1f1b6a80 ambient/house-creaking.ogg -> 0
PLAY: 0x7f3e1f1b5f20 ambient/wind-blustery.ogg -> 1
PLAY: 0x7f3e1f1b5860 ambient/ocean.ogg -> 2
PREVIOUS LEVEL: crevice-village-central.cfg
GET SAVE FILE PATH: /home/shadowm/.frogatto/save.cfg
ERROR: Tried to serialize type which cannot be serialized
FORMULA: data/objects/playable/frogatto_playable.cfg 244 (column 17)[if(not (level.id in vars.levels_visited),
                         add(vars.levels_visited, [level.id])),
                                         animation('stand')/*,
                                         if(self.hitpoints < 1, achievement('sans_hat'))*/]
terminate called after throwing an instance of 'type_error'
Aborted