Crash in Dates.createDictionary() line 206

[maniksejwal]

Dates.java line 206 com.memory_athlete.memoryassistant.disciplines.Dates.createDictionary

Caused by java.lang.IllegalStateException
Fragment Dates{4325675} not attached to a context.
android.support.v4.app.Fragment.requireContext (Fragment.java:696)
android.support.v4.app.Fragment.getResources (Fragment.java:760)
com.memory_athlete.memoryassistant.disciplines.Dates.createDictionary (Dates.java:206)
com.memory_athlete.memoryassistant.disciplines.WordDisciplineFragment$DictionaryAsyncTask.doInBackground (WordDisciplineFragment.java:39)
com.memory_athlete.memoryassistant.disciplines.WordDisciplineFragment$DictionaryAsyncTask.doInBackground (WordDisciplineFragment.java:36)
android.os.AsyncTask$2.call (AsyncTask.java:305)
java.lang.Thread.run (Thread.java:761)

APK version: 90 Android version: 7.1.1 Device: Moto E (4) Plus