TypeError thrown

Argument 1 passed to lsolesen\pel\PelJpeg::setExif() must be an instance of lsolesen\pel\PelExif, null given, called in /mnt/web301/c0/93/51700093/htdocs/dpsg/wp/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_data/pel-0.9.6/class.exif_writer.php on line 121