Incorrect setting collection field to null leads to further problems with iterator

Generate tests in the following configuration:

timeLimit=60
methodFilter = "org.usvm.samples.arrays.ArrayStoreExceptionExamples.*"
projectFilter = listOf("samples")

An failing test:

@Test
    public void testFillWithTreeSet1() throws Exception  {
        ArrayStoreExceptionExamples arrayStoreExceptionExamples = new ArrayStoreExceptionExamples();
        TreeSet treeSet = ((TreeSet) createInstance("java.util.TreeSet"));
        setField(treeSet, "java.util.TreeSet", "m", null);
        
        java.lang.Object[] actual = arrayStoreExceptionExamples.fillWithTreeSet(treeSet);
        
        java.lang.Object[] expected = new java.lang.Object[1];
        TreeSet treeSet1 = ((TreeSet) createInstance("java.util.TreeSet"));
        Object present = createInstance("java.lang.Object");
        setField(treeSet1, "java.util.TreeSet", "PRESENT", present);
        setField(treeSet1, "java.util.TreeSet", "serialVersionUID", -2479143000061671589L);
        setField(treeSet1, "java.util.AbstractCollection", "MAX_ARRAY_SIZE", 2147483639);
        expected[0] = ((Object) treeSet1);
        
        int expectedSize = expected.length;
        assertEquals(expectedSize, actual.length);
        assertTrue(deepEquals(expected, actual));
    }

Let's pay attention to the line: setField(treeSet, "java.util.TreeSet", "m", null);
During the deepEquals method call, NullPointerException occurs.