500 error when saving changes

Good morning,

I have an issue with saving. I am simply trying to add the following text at the bottom of the contact section:

“However, if you need to urgently contact us, you are welcome to call us on: +91 xxxx xxxx (Please only use this number for urgent matters).”

But every time I select saves it fails and states due to a 500 error. I would really appreciate if you could fix it or suggest what I can do. Thank you.