/opt/local/ruby-2.3.4/bin/ruby(sigsegv+0x3e) [0x55bda632f12e] signal.c:890
/lib/x86_64-linux-gnu/libpthread.so.0 [0x7f1a04d960c0]
/opt/local/ruby-2.3.4/lib/ruby/gems/2.3.0/gems/ox-2.4.11/ext/ox/ox.so(parse+0xf8d) [0x7f19fbf2b5cd] sax.c:935
/opt/local/ruby-2.3.4/lib/ruby/gems/2.3.0/gems/ox-2.4.11/ext/ox/ox.so(protect_parse+0x9) [0x7f19fbf2de29] sax.c:66
/opt/local/ruby-2.3.4/bin/ruby(rb_protect+0xf9) [0x55bda626c529] eval.c:894
/opt/local/ruby-2.3.4/lib/ruby/gems/2.3.0/gems/ox-2.4.11/ext/ox/ox.so(ox_sax_parse+0x320) [0x7f19fbf28b40] sax.c:165
/opt/local/ruby-2.3.4/lib/ruby/gems/2.3.0/gems/ox-2.4.11/ext/ox/ox.so(sax_html+0x76) [0x7f19fbf2df66] ox.c:1100
Seems to happen in ox gem.
Ask the author of it.