<RecyclerView (with Adapter) doesnt show my items>...

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RecyclerView (with Adapter) doesnt show my items
I am using RecyclerView to show my items. But when i save an item, recyclerView doesnt show it. I am saving my items with a custom dialog. So the saving happens in the same fragment with my recycler view's fragment. When i save item, first i dont get any error but recyclerView doesnt show any items. But when i navigate to another fragment and navigate back, recyclerView doesnt show anything again and this time i am getting this error;
java.lang.NullPointerException: Attempt to invoke virtual...