Exiv2

One of our users reported that the attached JPG can't be tagged.

It ends up throwing an exception in tags.cpp in the ExifKey constructor:

ExifKey::ExifKey(uint16_t tag, const std::string& groupName)
        : p_(new Impl)
    {
        IfdId ifdId = groupId(groupName);
        // Todo: Test if this condition can be removed
        if (!Internal::isExifIfd(ifdId) && !Internal::isMakerIfd(ifdId)) {
-->         throw Error(23, ifdId);
        }
        const TagInfo* ti = tagInfo(tag, ifdId);
        if (ti == 0) {
            throw Error(23, ifdId);
        }
        p_->groupName_ = groupName;
        p_->makeKey(tag, ifdId, ti);
    }

ifdId is equal to "lastId". I tried removing the condition as per the comment, but the tagInfo() call then returns null and the second exception is thrown instead :)