Doesn't look like either Cartography or Blaze Map is currently maintained. Not sure whether to give this to you or one of them. This doesn't happen consistently, just sometimes, when opening the map.

crash-2023-09-26_20.54.39-client.txt

Not a fix, but here's a workaround: go into saves/[worldname]/blazemap-client and delete all the 0-byte png's (thanks Gaelmare).