Android : KitKat WebView loadDataWithBaseURL

I have problem with use of loadDataWithBaseURL function. In sdk above 19 all works fine, but in KitKat i occur a problem.

mReceiptWebView.addJavascriptInterface(
                                    getInstance().new RenderHTMLReceiptTask(mContext, mPrint),
                                    "Android");   
mReceiptWebView.loadDataWithBaseURL(null, html, "text/html", "UTF-8", null);

In html I use body onload event to fire javascript interface callback.