Findbugs报告了一个不兼容的位掩码错误，但我不知道怎么回事

    public int compare(MyClass left, MyClass right) {
        if (left == null) {
            return right == null ? 0 : 1;
        }
        if (right == null) {
            return -1;
        }
        // do some other comparing
    }

44: sipush  14625
47: invokevirtual   #10; //Method com_cenqua_clover/CoverageRecorder.iget:(I)I
50: ifeq    57
53: iconst_1
54: goto    58
57: iconst_0
58: iconst_1
59: ior
60: ifne    85

public int compare(MyClass left, MyClass right) {

    if (left == null) {
        return right == null ? 0 : 1;
    }
    if (right == null) {
        return -1;
    }
    // do some other comparing
}