#vulnerable code 
                                public List<Parameter> parse(ParserData info, @Nullable Tokens tokens) {
        if (TokensUtils.isEmpty(tokens)) {
            return new ArrayList<>(0);
        }

        TokenRepresentation[] tokenRepresentations = tokens.toArray();
        List<Parameter> parameters = new ArrayList<>(tokenRepresentations.length / 3 + 1);

        if (tokens.size() == 0) {
            return parameters;
        }

        for (int i = 0; i < tokenRepresentations.length; i += 3) {
            TokenRepresentation parameterTypeRepresentation = tokenRepresentations[i];
            TokenRepresentation parameterNameRepresentation = tokenRepresentations[i + 1];

            String parameterType = parameterTypeRepresentation.getToken().getTokenValue();
            String parameterName = parameterNameRepresentation.getToken().getTokenValue();

            PandaScript script = info.getComponent(PandaComponents.PANDA_SCRIPT);
            ModuleLoader moduleLoader = script.getModuleLoader();
            ClassPrototype type = moduleLoader.forClass(parameterType).get();

            if (type == null) {
                throw new PandaParserException("Unknown type '" + parameterType + "'");
            }

            Parameter parameter = new PandaParameter(type, parameterName);
            parameters.add(parameter);

            if (i + 2 < tokenRepresentations.length) {
                TokenRepresentation separatorRepresentation = tokenRepresentations[i + 2];
                Token separator = separatorRepresentation.getToken();

                if (separator.getType() != TokenType.SEPARATOR) {
                    throw new PandaParserException("Unexpected token " + separatorRepresentation);
                }
            }
        }

        return parameters;
    } 
                            #location 22 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public List<Parameter> parse(ParserData info, @Nullable Tokens tokens) {
        if (TokensUtils.isEmpty(tokens)) {
            return new ArrayList<>(0);
        }

        TokenRepresentation[] tokenRepresentations = tokens.toArray();
        List<Parameter> parameters = new ArrayList<>(tokenRepresentations.length / 3 + 1);

        if (tokens.size() == 0) {
            return parameters;
        }

        for (int i = 0; i < tokenRepresentations.length; i += 3) {
            TokenRepresentation parameterTypeRepresentation = tokenRepresentations[i];
            TokenRepresentation parameterNameRepresentation = tokenRepresentations[i + 1];

            String parameterType = parameterTypeRepresentation.getToken().getTokenValue();
            String parameterName = parameterNameRepresentation.getToken().getTokenValue();

            PandaScript script = info.getComponent(PandaComponents.PANDA_SCRIPT);
            ModuleLoader moduleLoader = script.getModuleLoader();
            ClassPrototypeReference type = moduleLoader.forClass(parameterType);

            if (type == null) {
                throw new PandaParserException("Unknown type '" + parameterType + "'");
            }

            Parameter parameter = new PandaParameter(type, parameterName);
            parameters.add(parameter);

            if (i + 2 < tokenRepresentations.length) {
                TokenRepresentation separatorRepresentation = tokenRepresentations[i + 2];
                Token separator = separatorRepresentation.getToken();

                if (separator.getType() != TokenType.SEPARATOR) {
                    throw new PandaParserException("Unexpected token " + separatorRepresentation);
                }
            }
        }

        return parameters;
    }