Cannot convert undefined or null to object

[Sunpacker]

Describe the bug
After the first time i'm building the project there is the error in console:
Uncaught TypeError: Cannot convert undefined or null to object
at Function.keys ()
at src.c3e6f627.js:1
at src.c3e6f627.js:1
at src.c3e6f627.js:1

To Reproduce
Steps to reproduce the behavior:

1. Run command: npm run app-production
2. Go to the app server
3. Open console

Expected behavior
See 3d editor

Screenshots
https://imgur.com/AyXQgIM

Desktop (please complete the following information):

• OS: Windows 10 Ultimate x64
• Browser: chrome v.85
• nodejs: 14.5.0
• npm: 6.14.5