Facebook Callback appends '#_=_' to Return URL

Question

Facebook callback has started appending #_=_ hash underscore to the Return URL

Does anyone know why? What is the solution?

Answer 1

Adding this to my redirect page fixed the problem for me ...

if (window.location.href.indexOf('#_=_') > 0) {
    window.location = window.location.href.replace(/#.*/, '');
}