#vulnerable code 
                             @Test
	public void testGetHeaderNoCheck() throws IOException {
		assertEquals(4, abstractReader.getCsvHeader(false).length);
		assertEquals(4, abstractReader.getCsvHeader(false).length);
		assertEquals(4, abstractReader.getCsvHeader(false).length);
		assertNull(abstractReader.getCsvHeader(false)); // should be EOF
	} 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Test
	public void testGetHeaderNoCheck() throws IOException {
		assertEquals(4, abstractReader.getHeader(false).length);
		assertEquals(4, abstractReader.getHeader(false).length);
		assertEquals(4, abstractReader.getHeader(false).length);
		assertNull(abstractReader.getHeader(false)); // should be EOF
	}