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Description of problem:
Crash

Version-Release number of selected component (if applicable):
gnome-boxes-3.22.4-2.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. open Boxes
2. click New
3. click Back 

Actual results:
crash

Expected results:
no crash

Additional info:

Created attachment 1265807 [details]
backtrace

This issue is caused by the C files being generated against an old vala version. By cleaning the vala stamp files the build will generate them from a newer Vala version where the bug is fixed. The same fix has been proposed for Fedora.

The button is greyed out, so no crash ;-)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2124