The following upstream bug report has been filed:
https://bugs.kde.org/show_bug.cgi?id=367944
Bug ID: 367944
Summary: Discover crashes when opened twice.
Product: Discover
Version: 5.7.3
Platform: Debian testing
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: discover
Assignee: aleixpol@kde.org
Reporter: xypron.glpk@gmx.de