Crash when having quoted JSON in config

[kescherCode]

I have a config with this location block in it:

    location = /.well-known/matrix/server {
        default_type application/json;
        return 200 '{"m.server":"matrix.kescher.at:443"}';
    }

If nginxbeautifier tries to format this, it crashes with the following error:

/tmp/nginxbeautifier/nginxbeautifier.js:142
        return input.match(catchRegex)[1];
                                      ^

TypeError: Cannot read property '1' of null
    at extractTextBySeperator (/tmp/nginxbeautifier/nginxbeautifier.js:142:39)
    at extractAllPossibleText (/tmp/nginxbeautifier/nginxbeautifier.js:164:29)
    at strip_line (/tmp/nginxbeautifier/nginxbeautifier.js:193:35)
    at Object.clean_lines (/tmp/nginxbeautifier/nginxbeautifier.js:225:50)
    at Object.<anonymous> (/tmp/nginxbeautifier/index.js:235:38)
    at Module._compile (node:internal/modules/cjs/loader:1108:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
    at Module.load (node:internal/modules/cjs/loader:973:32)
    at Function.Module._load (node:internal/modules/cjs/loader:813:14)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)

It seems that it tries to format curly braces within single-quoted strings, which it shouldn't.