Window doesn't close

[giraffekey]

When the X button gets clicked, the window never closes. I have to close it manually from the command line but then I get this:

signal (2): Interrupt
in expression starting at Main.jl:4
epoll_pwait at /usr/bin/../lib64/libc.so.6 (unknown line)
uv__io_poll at /usr/bin/../lib64/libjulia.so.1 (unknown line)
uv_run at /usr/bin/../lib64/libjulia.so.1 (unknown line)
jl_task_get_next at /usr/bin/../lib64/libjulia.so.1 (unknown line)
unknown function (ip: 0x7f939148e549)
unknown function (ip: 0x7f939151a431)
unknown function (ip: 0x7f93ab27d293)
unknown function (ip: 0x7f93ab27d3c5)
unknown function (ip: (nil))
unknown function (ip: (nil))

Main.jl:4 is where the window is created. I'm on Fedora Linux.