User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101
Firefox/56.0
Build Identifier: 

OS: opensuse tumbleweed (KDE)
GIMP: 2.8.22
ufraw: 0.22

Reproducible: Always

Steps to Reproduce:
1. open any RAW-file with GIMP (i.e. CR2 or dng-files) -> ufraw-plugin opens
2. click on "save"-button

or:

1. open any RAW-file with ufraw (standalone)
2. click on "GIMP"-button
Actual Results:  
A window appears with the following information:
'/home/picture.CR2' failed: Procedure 'file-ufraw-load' returned no return
values

Expected Results:  
RAW-file should be converted into another format (i.e. jpg, png) and should be
opened in GIMP.

It's possible to simply save the RAW-file in different of formats (i.e. jpg,
png) directly from ufraw standalone.

If ufraw is started from BASH you get the following information:

user@host:~> ufraw
** (ufraw:1742): WARNING **: _ufarray_object_event() value not found
Segmentation fault (core dumped)
user@host:~> While parsing XMP metadata:
Error: No XMP packet found
/usr/lib64/gimp/2.0/plug-ins/ufraw-gimp: fatal error: Segmentation fault