Error if keyword field contains more than 252 characters

After submitting many keywords, I came across the same error as described in this topic kubik-rubik.de/forum/efseo-easy-frontend...-string-must-be-of-t
After checking, the content of the field is too permissive. The keyword field allows 255 characters to be entered, but the MySQL field seems to allow only 252. I tested and checked that if I add 1, 2 or 3 characters to the 252 characters already entered, I get this error. And then I have to log out and log back to access the component again. There, I note that the keywords still contain 252 characters.
I also tested that limit the maxlength of the field to 252 characters in administrator/components/com_easyfrontendseo/tmpl/entry/form.php file solves the problem.

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