Complete version is apper-0.9.3-0.8.20170226.fc26.x86_64
System is Fedora-26 with all updates installed
4-Processor True Intel

Here is the log of an attempt to start apper from a console; this always happens:
$ apper
QCommandLineParser: option not defined: "install-mime-type"
QCommandLineParser: option not defined: "install-package-name"
QCommandLineParser: option not defined: "install-provide-file"
QCommandLineParser: option not defined: "install-catalog"
QCommandLineParser: option not defined: "remove-package-by-file"
kf5.kwidgetsaddons: Invalid pixmap specified.
kf5.kwidgetsaddons: Invalid pixmap specified.
KCrash: Application 'apper' crashing...
KCrash: Attempting to start /usr/libexec/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0

[1]+  Stopped                 apper
$ <Here the bug reporting window pops up; the log continues when I close it.>

QSocketNotifier: Invalid socket 8 and type 'Read', disabling...
QSocketNotifier: Invalid socket 12 and type 'Read', disabling...
QSocketNotifier: Invalid socket 9 and type 'Read', disabling...

[1]+  Exit 253                apper