Cannot Access Customise Panel

Hi, Wonder if you could help…

We’re unable to gain access to the Customise panel for the website Autohaus Campervan Conversions following the recent upgrade to WordPress 4.6 (and associated plugins).

The error message we receive when trying to access the Customise panel is:
The www.autohausvw.co.uk page isn’t working www.autohausvw.co.uk is currently unable to handle this request.

We also downloaded the websites error log and saw this error message:
Sun Aug 21 01:01:02.640570 2016 pid 32382 AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use ‘LimitInternalRecursion’ to increase the limit if necessary. Use ‘LogLevel debug’ to get a backtrace.

We’ve looked into the Redirection plugin and there are no redirects set up for the customise panel. However, disabling the plugin does allow access to the customise panel.

The Redirection plugin doesn’t seem to be preventing access to anything else through the back-end either.

We asked our theme author for their thoughts and this was their response:

The only thing I could think of is if you are redirecting the homepage preventing it to load in the Customizer. It would be very easy though for the plugin developer to add a little check to prevent their plugin from running in the customizer though via the is_customize_preview() function.
No redirection plugin should be running in the backend so they really should have a check to prevent any redirections if is_admin() or is_customize_preview() return true.
Unfortunately I can’t really provide much feedback since I am not familiar with the plugin and it is possible the issue is created by a specific redirect on the site. But I hope this helps a bit!

We wanted to ask if you have any advice on how we can solve this issue or if anyone’s faced the same problem?
Many thanks in advance for your help.
Jamie

https://ww.wp.xz.cn/plugins/redirection/