glTF exporter: add some checks on animation data, fixing error with weird files

1 files changed, 2 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_sampler_keyframes.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_sampler_keyframes.py
index a24b2298..5d7763d0 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_sampler_keyframes.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_sampler_keyframes.py
@@ -181,6 +181,8 @@ def gather_keyframes(blender_object_if_armature: typing.Optional[bpy.types.Objec
     else:
         # Just use the keyframes as they are specified in blender
         frames = [keyframe.co[0] for keyframe in channels[0].keyframe_points]
+        # some weird files have duplicate frame at same time, removed them
+        frames = sorted(set(frames))
         for i, frame in enumerate(frames):
             key = Keyframe(channels, frame, bake_channel)
             # key.value = [c.keyframe_points[i].co[0] for c in action_group.channels]