Cannot call method 'replace' of null

Noticed this while trying to change the colors on adaptive / corolla theme (latest). I had to change the changeColor function in color.js to the following:

// Ratio is between 0 and 1
var changeColor = function(color, ratio, darker) {
  // Trim trailing/leading whitespace
  try {
    color = color.replace(/^\s*|\s*$/, '');

    // Expand three-digit hex
    color = color.replace(
        /^#?([a-f0-9])([a-f0-9])([a-f0-9])$/i,
        '#$1$1$2$2$3$3'
    );

    // Calculate ratio
    var difference = Math.round(ratio * 256) * (darker ? -1 : 1),
        // Determine if input is RGB(A)
        rgb = color.match(new RegExp('^rgba?\\(\\s*' +
            '(\\d|[1-9]\\d|1\\d{2}|2[0-4][0-9]|25[0-5])' +
            '\\s*,\\s*' +
            '(\\d|[1-9]\\d|1\\d{2}|2[0-4][0-9]|25[0-5])' +
            '\\s*,\\s*' +
            '(\\d|[1-9]\\d|1\\d{2}|2[0-4][0-9]|25[0-5])' +
            '(?:\\s*,\\s*' +
            '(0|1|0?\\.\\d+))?' +
            '\\s*\\)$'
        , 'i')),
        alpha = !!rgb && rgb[4] != null ? rgb[4] : null,

        // Convert hex to decimal
        decimal = !!rgb? [rgb[1], rgb[2], rgb[3]] : color.replace(
            /^#?([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])/i,
            function() {
                return parseInt(arguments[1], 16) + ',' +
                    parseInt(arguments[2], 16) + ',' +
                    parseInt(arguments[3], 16);
            }
        ).split(/,/),
        returnValue;

    // Return RGB(A)
    return !!rgb ?
        'rgb' + (alpha !== null ? 'a' : '') + '(' +
            Math[darker ? 'max' : 'min'](
                parseInt(decimal[0], 10) + difference, darker ? 0 : 255
            ) + ', ' +
            Math[darker ? 'max' : 'min'](
                parseInt(decimal[1], 10) + difference, darker ? 0 : 255
            ) + ', ' +
            Math[darker ? 'max' : 'min'](
                parseInt(decimal[2], 10) + difference, darker ? 0 : 255
            ) +
            (alpha !== null ? ', ' + alpha : '') +
            ')' :
        // Return hex
        [
            '#',
            pad(Math[darker ? 'max' : 'min'](
                parseInt(decimal[0], 10) + difference, darker ? 0 : 255
            ).toString(16), 2),
            pad(Math[darker ? 'max' : 'min'](
                parseInt(decimal[1], 10) + difference, darker ? 0 : 255
            ).toString(16), 2),
            pad(Math[darker ? 'max' : 'min'](
                parseInt(decimal[2], 10) + difference, darker ? 0 : 255
            ).toString(16), 2)
        ].join('');
    }
    catch(e) {
      return '#000000';
    }
};