#vulnerable code 
                             private int[] getCoefShape(){
		NDArrayWrapper arrayWrapper = (NDArrayWrapper)get("coef_");

		NDArray array = arrayWrapper.getContent();

		return NDArrayUtil.getShape(array);
	} 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             private int[] getCoefShape(){
		return ClassDictUtil.getShape(this, "coef_");
	}