Can't play on Mac 10.10.5

[arbitrarymelodist]

Hi, first time poster, sorry if anything's wonky.

Used to play this game perfectly on my Mac until about mid-September. (Absolutely love it, by the way!) I updated the game and whenever I launch, it crashes immediately after giving it my RCT2 directory. 

--verbose gives the following output: 

Quote

Assertion failed: (length > 0), function decode_chunk_rle_with_size, file /Users/travis/build/OpenRCT2/OpenRCT2/src/openrct2/util/sawyercoding.c, line 246.

Abort trap: 6

Any help would be appreciated. Thanks!