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Unable to export as FBX
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.06

Blender Version
Broken: version: 2.83.3, branch: master, commit date: 2020-07-22 06:01, hash: rB353e5bd7493e
Worked: (newest version of Blender that worked as expected)

Addon Information
Name: FBX format (4, 20, 3)
Author: Campbell Barton, Bastien Montagne, Jens Restemeier

Short description of error
[Please fill out a short description of the error here]

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

Traceback (most recent call last):

File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\__init__.py", line 634, in execute
  return export_fbx_bin.save(self, context, **keywords)
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 3198, in save
  ret = save_single(operator, context.scene, depsgraph, filepath, **kwargs_mod)
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 3094, in save_single
  fbx_objects_elements(root, scene_data)
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2894, in fbx_objects_elements
  fbx_data_mesh_elements(objects, me_obj, scene_data, done_meshes)
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 1174, in fbx_data_mesh_elements
  elem_data_single_int32_array(lay_uv, b"UVIndex", (uv2idx[uv_id] for uv_id in _uvtuples_gen(t_luv, t_lvidx)))
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\fbx_utils.py", line 504, in elem_data_single_int32_array
  return _elem_data_single(elem, name, value, "add_int32_array")
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\fbx_utils.py", line 451, in _elem_data_single
  getattr(sub_elem, func_name)(value)
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\encode_bin.py", line 161, in add_int32_array
  data = array.array(data_types.ARRAY_INT32, data)
File "C:\Program Files\Blender Foundation\Blender 2.83\2.83\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 1174, in <genexpr>
  elem_data_single_int32_array(lay_uv, b"UVIndex", (uv2idx[uv_id] for uv_id in _uvtuples_gen(t_luv, t_lvidx)))

KeyError: ((nan, nan), 887)

location: <unknown location>:-1