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After a Decent gameplay, I was going down the 2nd ladder inside the cave when this crash happened.

RUNTIME ERROR
  SAVEADD(HIT.LIST)
LINE 340: ATTEMPT TO GET LENGTH OF FIELD 'LIST' (A NIL VALUE)

IN SAVEGAME LINE 340
IN _UPDATE LINE 633

Web Version on Firefox 60.3.0 ESR

PS : I have been able to reload the savegame, I was right on top of the ladder with much less items than I had before. And I have been able to go down this time. Strange behavior oO

You had less items than before because that was your recent save file.

I've had this problem too, but with Google Chrome. I guess it happens on all browsers when you either have too many chests or too many tiles displaced.