When applying the "Bake Action" operator in pose mode it could throw an error saying "Nothing to Bake" even though bones are selected That is because the code was looking for a selected armature But in Pose Mode, clicking into empty space to de-select would also deselect the armature. Then box selecting would not make the armature selected again Reviewed by: Sybren A. Stüvel Differential Revision: https://developer.blender.org/D16593