Ruby

I was working with the Gosu gem, and I started making a game with it. Half the time when I quit the game, Ruby crashes and gives me this error:

./start: [BUG] Segmentation fault at 0x00000000000010 ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0] -- Crash Report log information -------------------------------------------- See Crash Report log file under the one of following: * ~/Library/Logs/CrashReporter * /Library/Logs/CrashReporter * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. -- Control frame information ----------------------------------------------- c:0001 p:0000 s:0002 E:001a98 TOP [FINISH] -- C level backtrace information ------------------------------------------- 0 ruby 0x000000010db68d36 rb_vm_bugreport + 134 1 ruby 0x000000010da1f423 report_bug + 307 2 ruby 0x000000010da1f2e4 rb_bug + 180 3 ruby 0x000000010daebf79 sigsegv + 153 4 libsystem_platform.dylib 0x00007fff8a8425aa _sigtramp + 26 5 libobjc.A.dylib 0x00007fff919cc62a _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 454 6 ??? 0x0000000000000000 0x0 + 0 -- Other runtime information ----------------------------------------------- * Loaded script: ./start * Loaded features: 0 enumerator.so 1 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/enc/encdb.bundle 2 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/enc/trans/transdb.bundle 3 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/rbconfig.rb 4 thread.rb 5 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/thread.bundle 6 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/compatibility.rb 7 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/defaults.rb 8 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/deprecate.rb 9 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/errors.rb 10 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/version.rb 11 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/requirement.rb 12 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/platform.rb 13 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/basic_specification.rb 14 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/stub_specification.rb 15 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/util/stringio.rb 16 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/specification.rb 17 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/exceptions.rb 18 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_gem.rb 19 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/2.1.0/monitor.rb 20 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb 21 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems.rb 22 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/path_support.rb 23 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/site_ruby/2.1.0/rubygems/dependency.rb 24 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-13/2.1.0-static/gosu-0.7.50/gosu.bundle 25 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/gosu-0.7.50/lib/gosu/swig_patches.rb 26 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/gosu-0.7.50/lib/gosu/patches.rb 27 /Users/addisonbean/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/gosu-0.7.50/lib/gosu.rb 28 /Users/addisonbean/git/idkyet/game/lib/player.rb 29 /Users/addisonbean/git/idkyet/game/lib/windows.rb [NOTE] You may have encountered a bug in the Ruby interpreter or extension libraries. Bug reports are welcome. For details: http://www.ruby-lang.org/bugreport.html Abort trap: 6 

The game is here: https://github.com/willchangename/game
You run ./start and exit by pressing enter on "Start" then press the escape key.

I'm sorry, but I have no idea what I causing this. I'm using Ruby 2.1.2, on OS X 1.9.4

I attached the crash log file for more information