imagemagick - RMagick crop! "bignum too big to convert into `long'" error -


i'm getting error rmagick 2.13.1 on rare occasions , error message doesn't make sense me. can shed insight? 

pagination = magick::imagelist.new pagination.from_blob(restclient.get(url)) pagination.each |f|    f.crop!(magick::southwestgravity, 0, 20, 368, 358)  end

crop! raises rangeerror: bignum big convert 'long' prior calling crop! can inspect f , "png 550x366 550x366+0+0 directclass 16-bit 625kb".

the code works , can't figure out causing break on image.


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