crash when selecting file for upload

[alexanderdd]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

Did not try to reproduce

Expected behaviour

No crash

Actual behaviour

Crash

Android version

see log

Device brand and model

see log

Stock or custom OS?

Custom (explain in "additional information")

Nextcloud android app version

see log

Nextcloud server version

see log

Using a reverse proxy?

I don't know

Android logs

Cause of error

Exception in thread "pool-14-thread-1" java.util.ConcurrentModificationException
    at java.util.ArrayList.sort(ArrayList.java:1472)
    at java.util.Collections.sort(Collections.java:206)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByDate.sortLocalFiles(FileSortOrderByDate.kt:51)
    at com.owncloud.android.ui.adapter.LocalFileListAdapter.lambda$setSortOrder$6(LocalFileListAdapter.java:392)
    at com.owncloud.android.ui.adapter.LocalFileListAdapter.$r8$lambda$WTDJyclhOx9wYl9P9c9Mv0A876o(Unknown Source:0)
    at com.owncloud.android.ui.adapter.LocalFileListAdapter$$ExternalSyntheticLambda3.run(D8$$SyntheticClass:0)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
    at java.lang.Thread.run(Thread.java:1012)

App information

• ID: com.nextcloud.client
• Version: 30340190
• Build flavor: generic

Device information

• Brand: google
• Device: sunfish
• Model: Pixel 4a
• Id: TQ3A.230805.001.S2
• Product: sunfish

Firmware

• SDK: 33
• Release: 13
• Incremental: 2025012701

Server error logs

Additional information

Graphene OS

[OverscorePlayZ]

Having the same issue, Android app crashes for the last few months whenever I go to upload files and sort by most recent or Z-A. If I "share" from the photos app and upload to nextcloud, sometimes I have to do it 3 times for it to actually work. The app is so buggy. I have battery on unrestricted, allow full background usage, everything is configured properly to my knowledge and it used to work fine. I even got a new phone recently, Z Fold 7, and it's having the exact same issue

[omicron-b]

Same issue here but the log looks a little different

Steps to reproduce

1. Begin manual uploading of photos
2. Try sorting local photos before selecting them for upload

Stock or custom OS?
Custom - Graphene OS

Nextcloud server version
Nextcloud Hub 10 (31.0.12)

Using a reverse proxy?
Yes, nginx

Cause of error

Exception in thread "pool-11-thread-1" java.util.ConcurrentModificationException
    at java.util.ArrayList.sort(ArrayList.java:1823)
    at java.util.Collections.sort(Collections.java:207)
    at kotlin.collections.CollectionsKt__MutableCollectionsJVMKt.sortWith(MutableCollectionsJVM.kt:42)
    at com.owncloud.android.utils.FileSortOrderByName.sortLocalFiles(FileSortOrderByName.kt:60)
    at com.owncloud.android.ui.adapter.LocalFileListAdapter.lambda$setSortOrder$6(LocalFileListAdapter.java:392)
    at com.owncloud.android.ui.adapter.LocalFileListAdapter.$r8$lambda$WTDJyclhOx9wYl9P9c9Mv0A876o(Unknown Source:0)
    at com.owncloud.android.ui.adapter.LocalFileListAdapter$$ExternalSyntheticLambda3.run(D8$$SyntheticClass:0)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1154)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:652)
    at java.lang.Thread.run(Thread.java:1563)

App information

• ID: com.nextcloud.client
• Version: 30340190
• Build flavor: generic

Device information

• Brand: google
• Device: akita
• Model: Pixel 8a
• Id: BP4A.251205.006.E1
• Product: akita

Firmware

• SDK: 36
• Release: 16
• Incremental: 2025122501