holder.cvContact.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                SingleContactFragment singleContactFragment = SingleContactFragment.newInstance(contact);
                FragmentTransaction transaction = ((Activity) context).getFragmentManager().beginTransaction();
                transaction.replace(R.id.rv_contact_list, singleContactFragment);
                transaction.commit();
            }
        });

01-19 20:35:01.892 13088-13088/com.xzii.pkg E/AndroidRuntime: FATAL EXCEPTION: main
                                                          Process: com.xzii.pkg, PID: 13088
                                                          java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.v7.widget.RecyclerView$ViewHolder.shouldIgnore()' on a null object reference
                                                              at android.support.v7.widget.RecyclerView.findMinMaxChildLayoutPositions(RecyclerView.java:3869)
                                                              at android.support.v7.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:3604)
                                                              at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3408)