The Control Panel works fine in Chrome and Firefox but when trying to login when using Safari the login box is empty.

I get errors in the console:

Error 1

TypeError: undefined is not an object (evaluating 'r[n].call')

Pointing at

t — bootstrap 74a64827bb471ba29fe7:54
// Execute the module function
modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);

GetsSuggestKey.js

Error 2

SyntaxError: Cannot declare a const variable twice: 'i'.

Pointing at

vendors.js:1