[4.2.0beta] Ext.util.CSS.getRule() error

[Ex_Soft]

//Ext.util.CSS.refreshCache();
Ext.util.CSS.getRule(".x-body");

TypeError: rules is null

        getRule: function(selector, refreshCache, rawCache) {
            var i;

            if (refreshCache) {
                CSS.refreshCache();
            }
            if (!Ext.isArray(selector)) {
                return rawCache ? rules[selector.toLowerCase()] : rules[selector.toLowerCase()].cssRule;
            }
            for (i = 0; i < selector.length; i++) {
                if (rules[selector[i]]) {
                    return rawCache ? rules[selector[i].toLowerCase()] : rules[selector[i].toLowerCase()].cssRule;
                }
            }
            return null;
        },

[skirtle]

Possibly the same as this?

http://www.sencha.com/forum/showthread.php?251691

[Ex_Soft]

Possibly the same as this?
http://www.sencha.com/forum/showthread.php?251691

Yes. But I didn't edit sources of ExtJS and called Ext.util.CSS.refreshCache() directly at start of application.

[evant]

Is it called inside an onReady block? Please post a test case.

[Ex_Soft]

Please post a test case.

Ext.onReady(function() {
    var
        rule = Ext.util.CSS.getRule(".x-body");
});

[evant]

As @skirtle said, it's the same bug he linked, will be fixed in the next beta refresh.