v9.4.2 does not work on iOS 10

[Bunlong]

Bug report

Describe the bug

After I upgraded Next.js version 9.3.6 to 9.4.2 I got the error on iOS 10 as following:

System information

• OS: Ubuntu
• Browser chrome, safari on iOS 10
• Version of Next.js: 9.4.2
• Version of Node.js: 12.16.1

[jamesmosier]

I wasn't able to reproduce this on an iPhone 7 running iOS 10.

Do you have a repository I could test with? @Bunlong