What code is responsible for writing to the log? My guess is that it uses a construct based on $SIG{__DIE__}. If so, and the handler does make responsible use of the $^S variable to distinguish eval from a normal die, this is what happens. This is what "responsible" looks like: 
$SIG{__DIE__} = sub {
    return if $^S;  # inside eval
    # write to log:
    ...
};

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Either get a properly updated module containing the error handler/log writer, fix the module if it's one of your own, or temporarily clear $SIG{__DIE__} for the eval, like this: 

{
    local $SIG{__DIE__};
    eval {
        # your code here
        ...
    };
}
if($@) {
    # oops!
    ... 
}

[download]

In reply to Re: Disable writing of eval'd errors to CGI log by bart
in thread Disable writing of eval'd errors to CGI log by Itatsumaki

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