Software manager error

I have noticed a strange behavior of software manager.
When I want to mark a program to install f.e. iscan my manager is suddenly closed. In my search engine I have written a word: iscan.
But then I have written in my search engine a word: scan and then I have scrolled my mouse down to find iscan. I can mark it and software manager is not closed.

Is this a bug?

Yes, it’s a bug (already reported).

Bug 1176949

I had the same issue and had to update via konsole and that fixed the issue for me.
Screenshot below shows the updates.

Operating System: openSUSE Tumbleweed 20200925
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1
Kernel Version: 5.8.10-1-default
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4810MQ CPU @ 2.80GHz
Memory: 31.0 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600