#vulnerable code 
                                @Override
    public void parse(Tokens source, ParserData data) {
        PandaScript script = data.getComponent(PandaComponents.PANDA_SCRIPT);
        TokenReader reader = new PandaTokenReader(source);

        GappedPatternExtractor extractor = PATTERN.extractor();
        List<Tokens> gaps = extractor.extract(reader);

        if (gaps == null) {
            throw new PandaParserException("Cannot parse expression::instance");
        }

        String className = gaps.get(0).asString();
        ModuleLoader moduleLoader = script.getModuleLoader();
        this.returnType = moduleLoader.forClass(className).fetch();

        if (returnType == null) {
            throw PandaParserFailure.builder()
                    .message("Unknown return type '" + className + "'")
                    .data(data)
                    .source(source)
                    .build();
        }

        ArgumentParser argumentParser = new ArgumentParser();
        this.arguments = argumentParser.parse(data, gaps.get(1));
        this.constructor = ConstructorUtils.matchConstructor(returnType, arguments);

        if (constructor == null) {
            throw new PandaParserFailure("Cannot find constructor of " + returnType.getClassName() + " for the specified arguments " + Arrays.toString(this.arguments), data);
        }
    } 
                            #location 15 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public void parse(Tokens source, ParserData data) {
        PandaScript script = data.getComponent(PandaComponents.PANDA_SCRIPT);
        TokenReader reader = new PandaTokenReader(source);

        GappedPatternExtractor extractor = PATTERN.extractor();
        List<Tokens> gaps = extractor.extract(reader);

        if (gaps == null) {
            throw new PandaParserException("Cannot parse expression::instance");
        }


        String className = gaps.get(0).asString();
        ModuleLoader moduleLoader = script.getModuleLoader();
        Optional<ClassPrototypeReference> reference = moduleLoader.forClass(className);

        if (!reference.isPresent()) {
            throw new PandaParserFailure("Unknown return type", data, source);
        }

        this.returnType = reference.get();
        this.arguments = new ArgumentParser().parse(data, gaps.get(1));
        this.constructor = ConstructorUtils.matchConstructor(returnType.fetch(), arguments);

        if (constructor == null) {
            throw new PandaParserFailure("Cannot find constructor of " + returnType.getClassName() + " for the specified arguments " + Arrays.toString(this.arguments), data);
        }
    }