check that the packagename is not null

app/src/main/java/com/zeapo/pwdstore/autofill/AutofillService.java

@@ -212,6 +212,7 @@ public class AutofillService extends AccessibilityService {
         // Match with the app if a webview was not found or one was found but
         // there's no title or url to go by
         if (webViewTitle == null || (webViewTitle.equals("") && webViewURL == null)) {
+            if (info.getPackageName() == null) return;
             packageName = info.getPackageName().toString();
 
             // get the app name and find a corresponding password