Steps to reproduce:
1. Download attached project
2. Select Assets->Art->Animations->Bombs->HERO@BOM_Run_L_00->BOM_Run_L_01
3. Drag Assets->Art->Models->Buster->Models->HERO_ZOO_Buster_00 into the animation preview window (inspector)

Results: Editor crashes.

Reproduced with: 2018.4.3f1, 2019.1.9f1, 2019.2.0b8
Not reproducible with: 2018.3.9f1, 2019.1.0b7, 2019.2.0a8, 2019.3.0a8
Regression introduced in: 2018.3.10f1, 2019.1.0b8, 2019.2.0a9

========== OUTPUTTING STACK TRACE ==================

0x000000014192E1C8 (Unity) mecanim::animation::TransformValuesFromClip
0x00000001418F679E (Unity) AnimationClipPlayable::ProcessAnimationRootMotionPass
0x00000001418F79D5 (Unity) AnimationClipPlayable::ProcessRootMotion
0x00000001418F5166 (Unity) AnimationMixerPlayable::MixerProcess
0x00000001418F7B7B (Unity) AnimationMixerPlayable::ProcessRootMotion
0x00000001418F5166 (Unity) AnimationMixerPlayable::MixerProcess
0x00000001418F7B7B (Unity) AnimationMixerPlayable::ProcessRootMotion
0x00000001418F4A8C (Unity) AnimationLayerMixerPlayable::LayerMixerProcess
0x00000001418F7AAA (Unity) AnimationLayerMixerPlayable::ProcessRootMotion
0x00000001419051D8 (Unity) AnimatorControllerPlayable::ProcessRootMotion
0x00000001418B9AC0 (Unity) `anonymous namespace'::ProcessPlayableGraph
0x00000001418B9FD9 (Unity) Animator::ProcessRootMotionStep
0x000000014189F779 (Unity) Animator::ProcessRootMotionJob
0x000000014189E9C8 (Unity) UnityEngine::Animation::BlockRangeJob<Animator::AnimatorJob>::Job
0x00000001408A1CA3 (Unity) JobQueue::Exec
0x00000001408A3F04 (Unity) JobQueue::WaitForJobGroupID
<...>
========== END OF STACKTRACE ===========