segfault in ruby proc

worker_segfault

/.../app/models/database_connection.rb:40: [BUG] Segmentation fault at 0x00000000000030
ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0127 p:0019 s:0530 e:000527 METHOD /.../app/models/database_connection.rb:40
c:0126 p:0077 s:0524 e:000523 METHOD /.../app/models/database_connection.rb:62
c:0125 p:0017 s:0518 e:000517 BLOCK  /.../app/models/database_connection.rb:15 [FINISH]
c:0124 p:---- s:0514 e:000513 CFUNC  :call
c:0123 p:---- s:0512 e:000511 CFUNC  :eval_unsafe
c:0122 p:0015 s:0508 e:000507 BLOCK  /.../bundle/ruby/2.2.0/bundler/gems/mini_racer-31ec118628a0/lib/mini_racer.rb:162
c:0121 p:0006 s:0506 e:000505 BLOCK  /.../bundle/ruby/2.2.0/bundler/gems/mini_racer-31ec118628a0/lib/mini_racer.rb:63 [FINISH]
c:0120 p:---- s:0504 e:000503 CFUNC  :synchronize
c:0119 p:0009 s:0501 e:000500 METHOD /.../bundle/ruby/2.2.0/bundler/gems/mini_racer-31ec118628a0/lib/mini_racer.rb:63
c:0118 p:0009 s:0498 e:000497 METHOD /.../bundle/ruby/2.2.0/bundler/gems/mini_racer-31ec118628a0/lib/mini_racer.rb:160