CovPass crash at check validity country selection after travel rules update

Technical details

• Device name: Samsung Galaxy A5 (2017) SM-A520F
• Android version: 8.0.0
• App version: 1.12.0

It is reproducible on other devices running Android 11 as well.

Describe the bug

CovPass crashes when attempting to select a country other than Germany in the validation screen if the travel rules have been updated.

Steps to reproduce the issue

In CovPass app

1. Uninstall CovPass app
2. Reinstall CovPass app from Google Play Store
3. Enable flight mode
4. Open CovPass app and run through onboarding
5. Scan 2/2 vaccination certificate
6. Tap “Check validity”
7. Note message “Travel rules not up to date”
8. Tap “Germany” in field “Country”
9. Note that list of countries starting with “Albania” is displayed
10. Close app via recent apps “Close all”
11. Disable flight mode and ensure Internet availability
12. Open CovPass app
13. Tap “Check validity”
14. Note that message “Travel rules not up to date” is no longer displayed
15. Tap “Germany” in field “Country”
16. App crashes

Expected behavior

1. The app should not crash. It should allow selection of another country other than Germany.
2. External data should not be able to crash the app. If there is an error in downloaded travel rules, it should cause an error message to be output and the app should fail gracefully.

Additional context

Logcat:

? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: de.rki.covpass.app, PID: 2515
    android.content.res.Resources$NotFoundException: Drawable de.rki.covpass.app:drawable/flag_rs with resource ID #0x7f0700db
    Caused by: android.content.res.Resources$NotFoundException: File res/Nw.xml from drawable resource ID #0x7f0700db
        at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:837)
        at android.content.res.ResourcesImpl.loadDrawable(ResourcesImpl.java:659)
        at android.content.res.Resources.getDrawableForDensity(Resources.java:891)
        at android.content.res.Resources.getDrawable(Resources.java:833)
        at android.content.Context.getDrawable(Context.java:605)
        at androidx.core.content.a$c.b(Unknown Source:0)
        at androidx.core.content.a.d(Unknown Source:6)
        at androidx.appcompat.widget.m0.k(Unknown Source:16)
        at androidx.appcompat.widget.m0.j(Unknown Source:2)
        at h.a.d(Unknown Source:4)
        at androidx.appcompat.widget.m.g(Unknown Source:8)
        at androidx.appcompat.widget.n.setImageResource(Unknown Source:4)
        at u8.d$a.O(Unknown Source:32)
        at u8.d.D(Unknown Source:37)
        at u8.d.l(Unknown Source:2)
        at androidx.recyclerview.widget.RecyclerView$g.m(Unknown Source:0)
        at androidx.recyclerview.widget.RecyclerView$g.c(Unknown Source:29)
        at androidx.recyclerview.widget.RecyclerView$v.H(Unknown Source:39)
        at androidx.recyclerview.widget.RecyclerView$v.I(Unknown Source:413)
        at androidx.recyclerview.widget.RecyclerView$v.p(Unknown Source:5)
        at androidx.recyclerview.widget.RecyclerView$v.o(Unknown Source:1)
        at androidx.recyclerview.widget.LinearLayoutManager$c.d(Unknown Source:11)
        at androidx.recyclerview.widget.LinearLayoutManager.s2(Unknown Source:0)
        at androidx.recyclerview.widget.LinearLayoutManager.U1(Unknown Source:38)
        at androidx.recyclerview.widget.LinearLayoutManager.X0(Unknown Source:356)
        at androidx.recyclerview.widget.RecyclerView.E(Unknown Source:38)
        at androidx.recyclerview.widget.RecyclerView.onMeasure(Unknown Source:65)
        at android.view.View.measure(View.java:23300)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6928)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
        at android.view.View.measure(View.java:23300)
        at androidx.core.widget.NestedScrollView.measureChildWithMargins(Unknown Source:38)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at androidx.core.widget.NestedScrollView.onMeasure(Unknown Source:0)
        at android.view.View.measure(View.java:23300)
        at androidx.constraintlayout.widget.ConstraintLayout$c.b(Unknown Source:528)
        at q0.b.a(Unknown Source:104)
        at q0.b.b(Unknown Source:157)
        at q0.b.d(Unknown Source:269)
        at p0.f.H1(Unknown Source:23)
        at androidx.constraintlayout.widget.ConstraintLayout.v(Unknown Source:135)
        at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(Unknown Source:71)
        at android.view.View.measure(View.java:23300)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6928)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.view.View.measure(View.java:23300)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6928)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at androidx.appcompat.widget.ContentFrameLayout.onMeasure(Unknown Source:154)
        at android.view.View.measure(View.java:23300)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6928)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
        at android.view.View.measure(View.java:23300)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6928)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.view.View.measure(View.java:23300)
? W/ActivityManager: crash : de.rki.covpass.app,0
? W/ActivityManager:   Force finishing activity de.rki.covpass.app/.main.MainActivity

[pucherd]

Hello, thank you for reporting the bug. We are analysing it and a hotfix version will be released soon.

[JilAuraya]

Hello 😃 Thank you for reporting the bug! We already created a fix which now goes through the usual review processes. We are eager to put it out asap! Please bear with us.