Help parse ErrorLog

There are sometimes such cases when everything worked and suddenly does not work. Apparently this happens, because otherwise I cannot explain what happened. I worked on the project, everything was fine, I ran Run several times, everything was fine, I added it to the layout textview, it was not displayed at startup. Commented out the lines that assign text to it to check, can text == ''. And here! When you start the application, after clicking on the "Skip Advertising" button, the "Application Stopped" crashes. Here is what we see in the log:

12-31 15:19:01.789 18522-18799/ru.qwerq.qwerq E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #2 Process: ru.qwerq.qwerq, PID: 18522 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:304) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) at java.util.concurrent.FutureTask.setException(FutureTask.java:222) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference at libcore.net.UriCodec.encode(UriCodec.java:132) at java.net.URLEncoder.encode(URLEncoder.java:57) at com.kosalgeek.genasync12.PostResponseAsyncTask.getPostDataString(PostResponseAsyncTask.java:235) at com.kosalgeek.genasync12.PostResponseAsyncTask.invokePost(PostResponseAsyncTask.java:183) at com.kosalgeek.genasync12.PostResponseAsyncTask.doInBackground(PostResponseAsyncTask.java:162) at com.kosalgeek.genasync12.PostResponseAsyncTask.doInBackground(PostResponseAsyncTask.java:33) at android.os.AsyncTask$2.call(AsyncTask.java:292) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818) 12-31 15:19:02.596 18522-18522/ru.qwerq.qwerq E/WindowManager: android.view.WindowLeaked: Activity ru.qwerq.qwerq.mainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{11588cdb VE.... R......D 0,0-1026,348} that was originally added here at android.view.ViewRootImpl.<init>(ViewRootImpl.java:367) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:271) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85) at android.app.Dialog.show(Dialog.java:306) at com.kosalgeek.genasync12.PostResponseAsyncTask.onPreExecute(PostResponseAsyncTask.java:151) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:591) at android.os.AsyncTask.execute(AsyncTask.java:539) at ru.qwerq.qwerq.mainActivity.get_content(mainActivity.java:598) at ru.qwerq.qwerq.mainActivity.onCreate(mainActivity.java:98) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) at android.app.ActivityThread.access$800(ActivityThread.java:156) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5389) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815) 

Rolled back files up to yesterday's successful launches - the same thing! Help return the meaning of life ...