Error saving cooperator. Invalid email address

I got an error saving cooperator, the email address is not allowed.

Error log:

gringlobal.6b524069714ca7fd2c7b.js:8 Textfield email error {type: 'validate', message: 'Invalid email address', ref: {…}}message: "Invalid email address"ref: name: "email"[[Prototype]]: Objectconstructor: ƒ Object()hasOwnProperty: ƒ hasOwnProperty()isPrototypeOf: ƒ isPrototypeOf()propertyIsEnumerable: ƒ propertyIsEnumerable()toLocaleString: ƒ toLocaleString()toString: ƒ toString()valueOf: ƒ valueOf()__defineGetter__: ƒ __defineGetter__()__defineSetter__: ƒ __defineSetter__()__lookupGetter__: ƒ __lookupGetter__()__lookupSetter__: ƒ __lookupSetter__()__proto__: (...)get __proto__: ƒ __proto__()set __proto__: ƒ __proto__()type: "validate"[[Prototype]]: Object