Undocking the Game view crashes the Editor

Thread 1 "Unity" received signal SIGINT, Interrupt.
0x00007ffff2a6199f in __GI___poll (fds=0x7fffffffd428, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
29    ../sysdeps/unix/sysv/linux/poll.c: No such file or directory.
(gdb) bt
#0  0x00007ffff2a6199f in __GI___poll (fds=0x7fffffffd428, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff2660c1a in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ffff2662a02 in xcb_wait_for_special_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fff94fe2aa6 in glPrimitiveBoundingBox () from /lib/x86_64-linux-gnu/libGLX_mesa.so.0
#4  0x00007fff94fe3e4a in glPrimitiveBoundingBox () from /lib/x86_64-linux-gnu/libGLX_mesa.so.0
#5  0x00007fff94fe552c in glPrimitiveBoundingBox () from /lib/x86_64-linux-gnu/libGLX_mesa.so.0
#6  0x00007fff8261863e in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#7  0x00007fff826d8e0b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#8  0x00007fff826d8e74 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#9  0x0000555559fd3204 in WaitAndClear () at ./PlatformDependent/Linux/GLContextLinux.cpp:107
#10 SetupDefaultContextState (context=..., setMultiThreaded=<optimized out>) at ./PlatformDependent/Linux/GLContextLinux.cpp:203
#11 0x0000555559fd3143 in MakeNewContextGL (level=<optimized out>, window=62915278, width=<optimized out>, height=<optimized out>, fullscreen=<optimized out>, doubleBuffer=<optimized out>, pbuffer=<optimized out>, depthTexture=<optimized out>, depthFormat=<optimized out>) at ./PlatformDependent/Linux/GLContextLinux.cpp:87
#12 0x0000555559fd3320 in SetupGraphicsContextFromWindow (window=62915278, width=<optimized out>, height=<optimized out>, enableStereo=@0x7fffffffd75f: false) at ./PlatformDependent/Linux/GLContextLinux.cpp:98
#13 0x000055555a104ce1 in WindowGLES::Reshape (this=0x55555edb9830, width=<optimized out>, height=<optimized out>, depthFormat=<optimized out>, hdr=<optimized out>) at ./Runtime/GfxDevice/opengles/WindowGLES.cpp:66
#14 0x000055555a104b9b in WindowGLES::WindowGLES (this=0x55555edb9830, window=<optimized out>, width=1, height=1, depthFormat=kFormatD24_UNorm_S8_UInt, hdr=false) at ./Runtime/GfxDevice/opengles/WindowGLES.cpp:24
#15 0x000055555a0dd16e in GfxDeviceGLES::CreateGfxWindow (this=<optimized out>, window=1, width=-1, height=-223995489, depthStencilFormat=kFormatNone, hdr=176) at ./Runtime/GfxDevice/opengles/GfxDeviceGLES.cpp:3809
#16 0x000055555bf2680b in GUIView::CreateGfxWindow (this=0x55555ecbfec0) at ./Editor/Platform/Linux/GUIView.cpp:755
#17 0x000055555bf2d240 in OnGUIViewMap (view=0x55555ecbfec0, event=<optimized out>) at ./Editor/Platform/Linux/GUIView.cpp:1969
#18 0x00007ffff38ac36f in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#19 0x00007ffff316ba56 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#20 0x00007ffff3189df1 in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007ffff318b0f3 in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007ffff38569b3 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#23 0x00007ffff371400a in gtk_main_do_event () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#24 0x00007ffff33fcf69 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
#25 0x00007ffff34300f6 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
#26 0x00007ffff307e17d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffff307e400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ffff307e6f3 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ffff371312d in gtk_main () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#30 0x000055555bf4f4ab in main (argc=<optimized out>, argv=<optimized out>) at ./Editor/Platform/Linux/main.cpp:535
(gdb)