Same issue with F-Droid's WiGLE WiFi Wardriving FOSS v.2.63 on newer and older Android versions alike. Updating it there would be a solid option, if possible.

Sorry for posting in an old thread, but this appears to still be relevant to the KeyStore error on FOSS 2.29 and master 2.48 (same exception). Running on Asus Zenfone 5 with an unofficial LineageOS 14.1 release. After submitting the login form: https://pastebin.com/zmJPEcMk (Login credentials and au...