Stacktrace

07-12 14:16:04.725 15614-15614/xx.xxx.xxxx E/AndroidRuntime: FATAL EXCEPTION: main
                                                                   Process: xx.xxx.xxxx, PID: 15614
                                                                   java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference
                                                                       at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:200)
                                                                       at android.support.v4.app.DialogFragment.dismiss(DialogFragment.java:171)
                                                                       at xx.xxx.xxxx.login.LoginFragment.onFinishedLoadingAll(LoginFragment.java:276)
                                                                       at x.xx.app.helpers.loading.LoadingWorker.checkLoadingTasks(LoadingWorker.java:194)
                                                                       at x.xx.app.helpers.loading.LoadingWorker.onTaskFinished(LoadingWorker.java:254)
                                                                       at x.xx.app.helpers.loading.jobs.LoginJob$1.onPostExecute(LoginJob.java:34)
                                                                       at x.xx.app.helpers.loading.jobs.LoginJob$1.onPostExecute(LoginJob.java:31)
                                                                       at android.os.AsyncTask.finish(AsyncTask.java:667)
                                                                       at android.os.AsyncTask.-wrap1(Unknown Source:0)
                                                                       at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:684)
                                                                       at android.os.Handler.dispatchMessage(Handler.java:105)
                                                                       at android.os.Looper.loop(Looper.java:164)
                                                                       at android.app.ActivityThread.main(ActivityThread.java:6540)
                                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                                       at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)