K-9 Mail crash when OpenKeychain's ContentProvider throws an exception

[kolAflash]

Expected behavior

open a new mail and just insert the defect mail address (I guess K9Mail will inform that it can not send when the mail address is invalid and that's just fine for this case I think)

Actual behavior

crash

Steps to reproduce

1. Open the html in the attached zip file peene-werft-107.html.zip on your Android device. (tested with Firefox and Chromium)
2. Tap on "Icon Briefumschlag" (the mail icon). That should bring up your default mail app - e.g. K9Mail.
3. K9Mail will crash immediately.

This is the defect mailto link:
mailto:BITTE%20DIE%20ADRESSE%20HIER%20EINTRAGEN?subject=Link-Tipp%3A%20Peene-Werft%20in%20Wolgast%3A%20Zum%20Warten%20verdammt%20%28tagesschau.de%29&body=Link-Tipp%3A%20Peene-Werft%20in%20Wolgast%3A%20Zum%20Warten%20verdammt%20%28tagesschau.de%29%0A%0Dhttp://www.tagesschau.de/wirtschaft/peene-werft-107.html%0A%0D%0A%0D

Instead of using the attached html you may also go to the following website. But the website may have fixed the defect mailto link by now!
https://www.tagesschau.de/wirtschaft/peene-werft-107.html

Environment

K-9 Mail version: 5.600 (PlayStore)

Android version: 8.1 (LineageOS-15.1)

Account type (IMAP, POP3, WebDAV/Exchange): IMAP

[cketti]

I'm not able to reproduce the crash with K-9 Mail 5.600.

Please provide a debug log. See https://github.com/k9mail/k-9/wiki/LoggingErrors

[kolAflash]

I couldn't reproduce on another phone either.

crashes:
Phone: FairPhone 2
OS: Android 8.1 (LineageOS-15.1)
Xposed installed but not activated
k9_mailto_crash.txt

no crash:
Phone: Samsung Galaxy S4 Mini
OS: Android 8.1 (LineageOS-15.1)
Xposed not installed

I'll try to see if it runs if I uninstall Xposed. But I got nothing K9Mail related installed in Xposed (only: AFWall+, GravityBox, I Said Off). So I think K9Mail should work fine even with Xposed active (and indeed most of K9Mail's functionality is working without problem - just not the mailto link).

[cketti]

The crash seems to be caused by an exception returned when communicating with OpenKeychain.

[kolAflash]

Indeed, the Samsung S4 Mini doesn't have OpenKeychain installed.

But even if the fault is on OpenKeychain's site, K9Mail shouldn't crash.