wpesrc crashes with GLX

Trying to use wpesrc GL rendering on X triggers a crash trying to do Wayland things:

#0  0x0000000000000000 in  ()
#1  0x00007ffff78e0af0 in ffi_call_unix64 () at /lib64/libffi.so.6
#2  0x00007ffff78e02ab in ffi_call () at /lib64/libffi.so.6
#3  0x00007fffe685dcd2 in wl_closure_invoke () at /lib64/libwayland-server.so.0
#4  0x00007fffe6859132 in wl_client_connection_data () at /lib64/libwayland-server.so.0
#5  0x00007fffe685bbea in wl_event_loop_dispatch () at /lib64/libwayland-server.so.0
#6  0x00007ffff7e621cb in operator() (__closure=0x0, base=0x7fffb400c600) at ../subprojects/wpebackend-fdo/src/ws.cpp:74
#7  _FUN(GSource*, GSourceFunc, gpointer) () at ../subprojects/wpebackend-fdo/src/ws.cpp:83
#8  0x00007ffff7d6478f in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#9  0x00007ffff7d64b18 in g_main_context_iterate.constprop () at /lib64/libglib-2.0.so.0
#10 0x00007ffff7d64e33 in g_main_loop_run () at /lib64/libglib-2.0.so.0
#11 0x00007ffff7e73db2 in WPEContextThread::s_viewThread(void*) (data=0x7fffd40b9fe0) at ../subprojects/gst-plugins-bad/ext/wpe/WPEThreadedView.cpp:156
#12 0x00007ffff7d8e7f2 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#13 0x00007ffff7ca0432 in start_thread () at /lib64/libpthread.so.0
#14 0x00007ffff7bce913 in clone () at /lib64/libc.so.6