#vulnerable code 
                                @Override
    protected void add(List<Object[]> records) {
        String insertQuery = this.resolveTableName(this.queryConfigurationEntry.getRecordInsertQuery());
        StringBuilder params = new StringBuilder();
        int fieldsLeft = this.attributes.size();
        while (fieldsLeft > 0) {
            params.append(QUESTION_MARK);
            if (fieldsLeft > 1) {
                params.append(SEPARATOR);
            }
            fieldsLeft = fieldsLeft - 1;
        }
        insertQuery = insertQuery.replace(Q_PLACEHOLDER, params.toString());
        try {
            this.batchExecuteQueriesWithRecords(insertQuery, records, false);
        } catch (SQLException e) {
            throw new RDBMSTableException("Error in adding events to '" + this.tableName + "' store: "
                    + e.getMessage(), e);
        }
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    protected void add(List<Object[]> records) {
        String sql = this.composeInsertQuery();
        try {
            this.batchExecuteQueriesWithRecords(sql, records, false);
        } catch (SQLException e) {
            throw new RDBMSTableException("Error in adding events to '" + this.tableName + "' store: "
                    + e.getMessage(), e);
        }
    }