Map fails to load when there is a 5th layer in the json

[left23]

Examples are 12, 15, 16

Uncaught TypeError: Cannot read properties of null (reading 'type')
    at <anonymous>:410:52
    at Array.forEach (<anonymous>)
    at <anonymous>:409:36
    at Array.forEach (<anonymous>)
    at <anonymous>:387:39
    at Array.forEach (<anonymous>)
    at AnimatedTiles.getAnimatedTiles (<anonymous>:383:26)
    at AnimatedTiles.init (<anonymous>:173:36)
    at n.loadLayers (layers.ts:37:28)
    at initialize.<anonymous> (loader.ts:94:19)