NullPointerException: Attempt to invoke virtual method

package com.example.akshay.smellslikebakin;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.LinearLayout;

public class IngredientsFragment extends Fragment {
    private static final String KEY_CHECKED_BOXES = "key_check_boxes";
    private CheckBox[] mCheckBoxes;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        int index = getArguments().getInt(ViewPagerFragment.KEY_RECIPE_INDEX);
        View view = inflater.inflate(R.layout.fragments_ingredients,container,false);

        LinearLayout linearLayout = (LinearLayout) view.findViewById(R.id.ingredients_layout);
        String[] ingredients = Recipes.ingredients[index].split("`");
        mCheckBoxes = new CheckBox[ingredients.length];
        boolean[] checkedBoxes = new boolean[mCheckBoxes.length];
        if(savedInstanceState != null && savedInstanceState.getBooleanArray(KEY_CHECKED_BOXES) != null);
        { checkedBoxes = savedInstanceState.getBooleanArray(KEY_CHECKED_BOXES);
        }
        setUpCheckBoxes(ingredients,linearLayout,checkedBoxes);
        return view;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        boolean[] stateOfCheckBoxes = new boolean[mCheckBoxes.length];
        int i=0;
        for(CheckBox checkbox : mCheckBoxes)
        {
            stateOfCheckBoxes[i]=checkbox.isChecked();
            i++;
        }
        outState.putBooleanArray(KEY_CHECKED_BOXES,stateOfCheckBoxes);
        super.onSaveInstanceState(outState);
    }

    private void setUpCheckBoxes(String[] ingredients, ViewGroup container, boolean[] checkedBoxes){
        int i=0;
        for (String ingredient: ingredients) {
            mCheckBoxes[i] = new CheckBox(getActivity());
            mCheckBoxes[i].setPadding(8,16,8,16);
            mCheckBoxes[i].setTextSize(20);
            mCheckBoxes[i].setText(ingredient);
            container.addView(mCheckBoxes[i]);
            if(checkedBoxes[i]){
                mCheckBoxes[i].toggle();
            }
            i++;
        }



    }

}