Fetch Failed: Cannot read property 'forEach' of undefined

Hi all,
I'm doing development on a windows machine running XAMPP. After the previous Grav update to 1.1.2 I seem to have broken the admin plugin. When logging in as super admin I get the following error on the Dashboard page:
`TypeError: Cannot read property 'forEach' of undefined at t.value http://localhost/gravdev/user/plugins/admin/themes/grav/js/admin.min.js?7aac8464a1:4:23682 at http://localhost/gravdev/user/plugins/admin/themes/grav/js/admin.min.js?7aac8464a1:4:22862 at http://localhost/gravdev/user/plugins/admin/themes/grav/js/admin.min.js?7aac8464a1:4:21909

When trying to login with a "pages-admin" (pages: true), I get the error above together with an access denied causing a constant refresh.

I'm guessing the issue is caused by my Apache server/PHP installation, but I can't seem to find the cause.

So far I tried:
New XAMPP install 7.0.8
New Grav installation 1.1.3
Created new user (CLI)

screenshot: (http://prnt.sc/c6cjpg)

Thanks in advance for your help

What is the PHP memory allocation for your installation? Try bumping it up to 128M if it's less than this.

It's a fresh XAMPP install, so it was 128M. I tried setting it higher but that didn't work.
When logging in as super admin I also get a curl error:

Invalid SSL certificate caused by CURL error number 60 
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Having same problem, with xampp.
Didn't find solution yet.

We've added an option to disable SSL certificate checking. This will be out in the next version of Grav/Admin.

It seems some installations have a very old version of openssl or something that cannot validate our perfectly valid SSL cert.