Comment 2 for bug 1747933

StacktraceTop:
 _cogl_buffer_initialize (buffer=buffer@entry=0x55c9fb61b210, ctx=ctx@entry=0x0, size=size@entry=20160, default_target=default_target@entry=COGL_BUFFER_BIND_TARGET_PIXEL_UNPACK, usage_hint=usage_hint@entry=COGL_BUFFER_USAGE_HINT_TEXTURE, update_hint=update_hint@entry=COGL_BUFFER_UPDATE_HINT_STATIC) at cogl-buffer.c:139
 _cogl_pixel_buffer_new (error=0x7ffefc16d8e0, data=0x0, size=20160, context=0x0) at cogl-pixel-buffer.c:88
 cogl_pixel_buffer_new (context=context@entry=0x0, size=size@entry=20160, data=data@entry=0x0) at cogl-pixel-buffer.c:119
 cogl_bitmap_new_with_size (context=0x0, width=width@entry=120, height=height@entry=42, format=format@entry=COGL_PIXEL_FORMAT_BGRA_8888_PRE) at cogl-bitmap.c:317
 clutter_canvas_emit_draw (self=0x55c9fb978570) at clutter-canvas.c:428