Unexpected error while packaging master build

Unity Engine
,
1

Hi,

We are facing an unknown error only happens in Master build.

Unexpected error while playing timeline: System.ArgumentNullException:“ArgumentNull_Generic”

3487742--277662--upload_2018-5-7_16-54-30.jpg
3487742--277662--upload_2018-5-7_16-54-30.jpg2394×1457 321 KB

Unity version: 2017.3.1p2 Script Backend: .NET
Win10 SDK: 16299

3487742--277663--upload_2018-5-7_17-2-19.png
3487742--277663--upload_2018-5-7_17-2-19.png1623×266 34.2 KB

Is there any doc we can refer to? It never happens in release or debug build.

2

Can we get a bug report? Does it happen in debug builds if you enable .NET Native in generated VS project properties?