Toast: Error updating: Reached code that was thought to be ...

• Device OS and version: CalyxOS 3.6.0
• Device model/manufacturer: Pixel 4a
• F-Droid version (in the About screen): 1.15.2 (upstream APK unmodified, same sig)
• F-Droid privileged extension version (if installed):

What did you do? (clear steps if possible)

• Fresh install. CalyxOS SetupWizard refreshes F-Droid index, which lead to this error.
• We've also got at least one user report of the same toast, they had a few custom repos configured.

What did you expect to see?

• Nothing.
• It does look F-Droid did refresh the index fine anyway, I see the apps listed after launching it.

What did you see instead?

• Vague toast. I love toast 🍞 but these toasts suck, I could barely read it (modern Android toast length restrictions means it was cutoff + it went away quickly)

Stacktrace

          UpdateService  E  Error updating repository file:///product/fdroid/repo/                                                                                                                                                                                                                                                                     
             System.err  W  org.fdroid.fdroid.IndexUpdater$UpdateException: CalyxOS Local Repository: Error getting F-Droid index file                                                                                                                                                                                                                 
                         W      at org.fdroid.fdroid.IndexV1Updater.update(IndexV1Updater.java:133)                                                                                                                                                                                                                                                    
                         W      at org.fdroid.fdroid.UpdateService.onHandleWork(UpdateService.java:483)
                         W      at androidx.core.app.JobIntentService$CommandProcessor.doInBackground(JobIntentService.java:391)
                         W      at androidx.core.app.JobIntentService$CommandProcessor.doInBackground(JobIntentService.java:382)
                         W      at android.os.AsyncTask$3.call(AsyncTask.java:394)
                         W      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
                         W      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
                         W      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
                         W      at java.lang.Thread.run(Thread.java:920)
                         W  Caused by: com.fasterxml.jackson.databind.JsonMappingException: Attempt to invoke virtual method 'java.util.Locale androidx.core.os.LocaleListCompat.getFirstMatch(java.lang.String[])' on a null object reference
                         W   at [Source: (org.fdroid.fdroid.ProgressBufferedInputStream); line: 434, column: 7] (through reference chain: java.lang.Object[][4]->org.fdroid.fdroid.data.App["localized"])
                         W      at com.fasterxml.jackson.databind.deser.SettableBeanProperty._throwAsIOE(SettableBeanProperty.java:623)
                         W      at com.fasterxml.jackson.databind.deser.SettableBeanProperty._throwAsIOE(SettableBeanProperty.java:611)
                         W      at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:143)
                         W      at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:371)
                         W      at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:164)
                         W      at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:195)
                         W      at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:21)
                         W      at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:4497)
                         W      at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2755)
                         W      at org.fdroid.fdroid.IndexV1Updater.parseApps(IndexV1Updater.java:370)
                         W      at org.fdroid.fdroid.IndexV1Updater.processIndexV1(IndexV1Updater.java:209)
                         W      at org.fdroid.fdroid.IndexV1Updater.processDownloadedIndex(IndexV1Updater.java:147)
                         W      at org.fdroid.fdroid.IndexV1Updater.update(IndexV1Updater.java:128)
                         W      ... 8 more
                         W  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.Locale androidx.core.os.LocaleListCompat.getFirstMatch(java.lang.String[])' on a null object reference
                         W      at org.fdroid.fdroid.data.App.getLocalizedLocaleMap(App.java:640)
                         W      at org.fdroid.fdroid.data.App.getLocalizedEntry(App.java:592)
                         W      at org.fdroid.fdroid.data.App.setLocalized(App.java:541)
                         W      at java.lang.reflect.Method.invoke(Native Method)
                         W      at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:141)
                         W      ... 18 more

Repo created from: https://gitlab.com/CalyxOS/calyxos-fdroid-repo Generated repo: https://gitlab.com/CalyxOS/platform_prebuilts_calyx_fdroid/-/tree/android12L/repo (aka the content of /product/fdroid/repo)