Crashes and ANRs , when try to publish

Hi everyone,
I got this error when I try to publish my app.:
java.lang.NullPointerException: Attempt to invoke virtual method ‘boolean java.lang.String.equals(java.lang.Object)’ on a null object reference
Exception java.lang.NullPointerException: Attempt to invoke virtual method ‘boolean java.lang.String.equals(java.lang.Object)’ on a null object reference
at com.google.appinventor.components.runtime.WebViewer$MyWebViewClient.shouldInterceptRequest (SourceFile:282)
at la.a (chromium-TrichromeWebViewGoogle6432.apk-stable-506007134:223)
at org.chromium.android_webview.AwContentsBackgroundThreadClient.shouldInterceptRequestFromNative (chromium-TrichromeWebViewGoogle6432.apk-stable-506007134:34)

any Idea?

How are you using the webviewer?
Taifun