#fixed code
                                public static void parse(final PgDatabase database, final String command) {
        final Parser parser = new Parser(command);
        parser.expect("ALTER", "VIEW");

        final String viewName = parser.parseIdentifier();
        final String schemaName = ParserUtils.getSchemaName(viewName, database);
        final String objectName = ParserUtils.getObjectName(viewName);

        final PgView view = database.getSchema(schemaName).getView(objectName);

        while (!parser.expectOptional(";")) {
            if (parser.expectOptional("ALTER")) {
                parser.expectOptional("COLUMN");

                final String columnName =
                        ParserUtils.getObjectName(parser.parseIdentifier());

                if (parser.expectOptional("SET", "DEFAULT")) {
                    final String expression = parser.getExpression();
                    view.addColumnDefaultValue(columnName, expression);
                } else if (parser.expectOptional("DROP", "DEFAULT")) {
                    view.removeColumnDefaultValue(columnName);
                } else {
                    parser.throwUnsupportedCommand();
                }
            } else if (parser.expectOptional("OWNER", "TO")) {
                // we do not support OWNER TO so just consume the output
                parser.getExpression();
            } else {
                parser.throwUnsupportedCommand();
            }
        }
    }
#vulnerable code 
                                public static void parse(final PgDatabase database, final String command) {
        final Parser parser = new Parser(command);
        parser.expect("ALTER", "VIEW");

        final String viewName = parser.parseIdentifier();
        final PgView view = database.getSchema(
                ParserUtils.getSchemaName(viewName, database)).getView(
                ParserUtils.getObjectName(viewName));

        while (!parser.expectOptional(";")) {
            if (parser.expectOptional("ALTER")) {
                parser.expectOptional("COLUMN");

                final String columnName =
                        ParserUtils.getObjectName(parser.parseIdentifier());

                if (parser.expectOptional("SET", "DEFAULT")) {
                    final String expression = parser.getExpression();
                    view.addColumnDefaultValue(columnName, expression);
                } else if (parser.expectOptional("DROP", "DEFAULT")) {
                    view.removeColumnDefaultValue(columnName);
                } else {
                    parser.throwUnsupportedCommand();
                }
            } else if (parser.expectOptional("OWNER", "TO")) {
                // we do not support OWNER TO so just consume the output
                parser.getExpression();
            } else {
                parser.throwUnsupportedCommand();
            }
        }
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE