htaccess dilemma

I added some code to my .htaccess , redirecting requests for a subfolder to the root domain, because there is a third-party site which is referring visitors to a subfolder which no longer exists (/MAU):

Rewriterule ^MAU(.*)$$1 [r=301,nc]

Unexpectedly, this has disrupted access to an existing subfolder on my site, directing browsers to a default "non-existent URL" site.  Here is the URL which is now broken:

Please advise how I can perform the redirect and avoid interfering with the valid link.
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Dan CraciunConnect With a Mentor IT ConsultantCommented:
Try removing nc (nocase). This will only match if the request is all caps:
Rewriterule ^MAU(.*)$$1 [r=301]
ddantesAuthor Commented:
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