Upgrade crashed and now site is not accessable

[Wasserlasser]

I upgraded the site through the Admin area and got this error

Allowed memory size of 83886080 bytes exhausted (tried to allocate 12288 bytes) in /home/users/torrausch/www/forum/src/XF/Db/Mysqli/Statement.php on line 127
Click to expand...

Now the site is not accessable anymore.
How can I reverse this?

Thanks


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