Modal Error: Attempted to assign to readonly property

[xueyongg]

Bug Report

Steps

Implement a modal component from Semantic-UI-React.
Run it on localhost.
Open that modal on your mobile phone. Iphone 6s was used.

Expected Result

Modal.Content content should appear.

Actual Result

The actual result that happened 💣

TypeError: Attempted to assign to readonly property.
Error occurs in Portal.js line 297

this.rootNode.style = style || ''; // when re-rendering, first remove listeners before re-adding them to the new node

Version

Added into the application through CDN:

2.3.1

Testcase

[welcome]

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[layershifter]

Duplicate #2886.

[nelsondaza]

Having the same issue in 0.81.1 and 0.81.0.
Rolling back to 0.80.2 fixes it.