Steps to Reproduce

http://10.1.3.45:8089/keikai-demo/excel_like

version: 5.3.0

browser: chrome incognito

1. type random words in several cells
2. increase font size to 48 or 72
3. error message appears

Current Result

while in live version

note.

this message didn't showed up in live version at first (F12), but happens after several trials

Expected Result

Debug Information

Workaround