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InvalidCharacterError: String contains an invalid character

Hello,


when I type an email response directly into the email popup, I get the following error when I click the Send button (and the response is not sent - screenshot attached):


InvalidCharacterError: String contains an invalid character


I found out it is caused by specific characters from the Slovak language:

  • email subject contains: č
  • response contains: ď

Other characters with diacritics may cause the same issue.

So far, I have not encountered the error (I have been using the add-on for several years).

I am using Checker Plus for Gmail - version 22.2.3.

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