#vulnerable code 
                                private boolean internalRemove(T element) {
        Integer lrem = nest.cat(JOhmUtils.getId(owner)).cat(field.getName())
                .lrem(1, JOhmUtils.getId(element).toString());
        unindexValue(element);
        return lrem > 0;
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private boolean internalRemove(T element) {
        boolean success = false;
        if (element != null) {
            Integer lrem = nest.cat(JOhmUtils.getId(owner))
                    .cat(field.getName()).lrem(1,
                            JOhmUtils.getId(element).toString());
            unindexValue(element);
            success = lrem > 0;
        }
        return success;
    }