#vulnerable code 
                                public static Class getClassReference(ParserContext ctx, TypeDescriptor tDescr) throws ClassNotFoundException {
        Class cls;
        if (ctx.hasImport(tDescr.className)) {
            cls = ctx.getImport(tDescr.className);
            if (tDescr.isArray()) {
                cls = findClass(null, repeatChar('[', tDescr.arraySize.length) + "L" + cls.getName() + ";", ctx);
            }
        }
        else {
            cls = createClass(tDescr.getClassName(), ctx);
            if (tDescr.isArray()) {
                cls = findClass(null, repeatChar('[', tDescr.getArrayLength()) + "L" + cls.getName() + ";", ctx);
            }
        }

        return cls;
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public static Class getClassReference(ParserContext ctx, TypeDescriptor tDescr) throws ClassNotFoundException {
        Class cls;
        if (ctx != null && ctx.hasImport(tDescr.className)) {
            cls = ctx.getImport(tDescr.className);
            if (tDescr.isArray()) {
                cls = findClass(null, repeatChar('[', tDescr.arraySize.length) + "L" + cls.getName() + ";", ctx);
            }
        }
        else if (ctx == null && hasContextFreeImport(tDescr.className)) {
            cls = getContextFreeImport(tDescr.className);
            if (tDescr.isArray()) {
                cls = findClass(null, repeatChar('[', tDescr.arraySize.length) + "L" + cls.getName() + ";", ctx);
            }
        }
        else {
            cls = createClass(tDescr.getClassName(), ctx);
            if (tDescr.isArray()) {
                cls = findClass(null, repeatChar('[', tDescr.arraySize.length) + "L" + cls.getName() + ";", ctx);
            }
        }

        return cls;
    }