It didn't happen on 3.6.2 nor 3.6.4. It now happens every single time as soon as I hit the actual menu entry from Tools > Devices > List My Equipment as well as when prompted by the Ekos profile window telling you that 'update your equimpment/optical train...', that one here:



In the logs the only possible entries I found related to the crashes are:

[2023-06-02T22:11:10.716 CEST DEBG ][ default] - ObsConditions::ObsConditions(int, double, Equipment, TelescopeType) Aperture value being used: 100
[2023-06-02T22:11:10.770 CEST WARN ][ default] - libpng warning: iCCP: known incorrect sRGB profile
[2023-06-02T22:11:10.776 CEST WARN ][ default] - libpng warning: iCCP: known incorrect sRGB profile
[2023-06-02T22:11:10.822 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.592 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.623 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.653 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.684 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.715 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.746 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.777 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.807 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.838 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.869 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.900 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.931 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.962 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:18.994 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.025 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.057 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.088 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.119 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.150 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.181 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.212 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:19.243 CEST WARN ][ default] - QFont::setPointSize: Point size <= 0 (0), must be greater than 0
[2023-06-02T22:11:57.331 CEST WARN ][ default] - "lat and LST parameters should only be used in KSPlanetBase objects."
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:11:57.332 CEST WARN ][ kf.i18n] - Trying to convert empty KLocalizedString to QString.
[2023-06-02T22:12:56.780 CEST WARN ][ org.kde.kstars] - No WishList Saved yet

Running on:
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - Welcome to KStars 3.6.5 Stable
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - Build: 2023-05-31T15:52:08Z
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - OS: "garuda"
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - API: "x86_64-little_endian-lp64"
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - Arch: "x86_64"
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - Kernel Type: "linux"
[2023-06-02T22:17:32.798 CEST INFO ][ org.kde.kstars] - Kernel Version: "6.3.5-zen1-1-zen"
[2023-06-02T22:17:32.799 CEST INFO ][ org.kde.kstars] - Qt Version: 5.15.9

This has been corrected in latest KStars stable build see:- www.indilib.org/forum/ekos/13431-kstars-...-optical-trains.html