getCacheTotalSize causes NullPointerException

After starting to use a new AdMob SDK I noticed the following exception in the Android Market Developer Console:http://www.blogger.com/img/blank.gif
java.lang.NullPointerException
at android.webkit.WebViewDatabase.getCacheTotalSize(WebViewDatabase.java:735)
at android.webkit.CacheManager.trimCacheIfNeeded(CacheManager.java:557)
at android.webkit.WebViewWorker.handleMessage(WebViewWorker.java:195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.os.HandlerThread.run(HandlerThread.java:60)

I solved it using a suggestion I found online. You can use other ways to disable the ads, depending which SDK you use:

WebViewDatabase webViewDB = WebViewDatabase.getInstance(this);
if (webViewDB == null) {
  View adView = findViewById(R.id.adView);
  if (adView != null)
    adView.setVisibility(View.GONE);
}

Anyhow, as far as I remember this issue was fixed in the Android OS 2.3+, so until this OS version will catch you have to disable the ads to people with this problem.