#fixed code
                                @Override
    public <T> T get(String claimName, Class<T> requiredType) {
        Object value = get(claimName);
        if (value == null) { return null; }

        if (Claims.EXPIRATION.equals(claimName) ||
            Claims.ISSUED_AT.equals(claimName) ||
            Claims.NOT_BEFORE.equals(claimName)
        ) {
            value = getDate(claimName);
        }

        return castClaimValue(value, requiredType);
    }
#vulnerable code 
                                @Override
    public <T> T get(String claimName, Class<T> requiredType) {
        Object value = get(claimName);
        if (value == null) { return null; }

        if (Claims.EXPIRATION.equals(claimName) ||
            Claims.ISSUED_AT.equals(claimName) ||
            Claims.NOT_BEFORE.equals(claimName)
        ) {
            value = getDate(claimName);
        }

        if (requiredType == Date.class && value instanceof Long) {
            value = new Date((Long)value);
        }

        if (!requiredType.isInstance(value)) {
            throw new RequiredTypeException("Expected value to be of type: " + requiredType + ", but was " + value.getClass());
        }

        return requiredType.cast(value);
    } 
                            #location 18 
                            #vulnerability type NULL_DEREFERENCE