#vulnerable code 
                                <T> Integer count(final JsonObject filters) {
        final DSLContext context = JooqInfix.getDSL();
        return null == filters ? context.fetchCount(this.vertxDAO.getTable()) :
                context.fetchCount(this.vertxDAO.getTable(), JooqCond.transform(filters, this.analyzer::column));
    } 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                <T> Future<T> fetchOneAsync(final String field, final Object value) {
        return JqTool.future(this.vertxDAO.fetchOneAsync(this.analyzer.column(field), value));
    }