How did I fix the «Illegal character was detected in the comment field, please check the entered text» / «Yorum alanında izin verilmeyen karakter tespit edildi, lütfen girilen metni kontrol ediniz» error of the IKEA Turkey website's contact form?

[dmitrii_fediuk]

[dmitrii_fediuk]

I have worked around it by removing quotes (") from my text.
I hope the IKEA customer support service will understand my message without quotes.