**Blender Version**
Blender version 2.75a
io_scene_fbx version 3.3.3 to 3.5.2
**Short description of error**
FBX exporter bin fails to export linked armature:
Traceback (most recent call last):
File "C:\Softs\Blender Foundation\Blender\2.75\scripts\addons\io_scene_fbx\__init__.py", line 577, in execute
return export_fbx_bin.save(self, context, **keywords)
File "C:\Softs\Blender Foundation\Blender\2.75\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 3001, in save
ret = save_single(operator, context.scene, filepath, **kwargs_mod)
File "C:\Softs\Blender Foundation\Blender\2.75\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2896, in save_single
scene_data = fbx_data_from_scene(scene, settings)
File "C:\Softs\Blender Foundation\Blender\2.75\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2419, in fbx_data_from_scene
empty_key = data_empties[ob_obj]
**Exact steps for others to reproduce the error**
Create a new file, delete all, add an armature, group it. Save it. {F219340}
Create a new file, link the previous group in it {F219339}
Export to fbx bin 7.4 => crash