App from F-Droid crashes after start on Android 6

[LeSpocky]

⚠️ Before posting ⚠️

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

Steps to reproduce

1. Open app
2. Wait
3. App crashes

Expected behaviour

Use the app without the app crashing.

Actual behaviour

App crashes right after start, not possible to do anything in the app.

Android version

6

Device brand and model

ASUS ZenPad 8

Stock or custom OS?

Stock

Nextcloud android app version

3.25.0 (from F-Droid)

Nextcloud server version

25

Using a reverse proxy?

No

Android logs

Cause of error

Exception in thread "main" android.util.AndroidRuntimeException: requestFeature() must be called before adding content
    at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:317)
    at android.app.Dialog.requestWindowFeature(Dialog.java:1126)
    at com.owncloud.android.ui.dialog.SslUntrustedCertDialog.onCreateDialog(SslUntrustedCertDialog.java:168)
    at androidx.fragment.app.DialogFragment.prepareDialog(DialogFragment.java:665)
    at androidx.fragment.app.DialogFragment.onGetLayoutInflater(DialogFragment.java:579)
    at androidx.fragment.app.Fragment.performGetLayoutInflater(Fragment.java:1755)
    at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:493)
    at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261)
    at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1901)
    at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1819)
    at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1762)
    at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:547)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5484)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

App information

• ID: com.nextcloud.client
• Version: 30250090
• Build flavor: generic

Device information

• Brand: asus
• Device: P024_1
• Model: P024
• Id: MMB29M
• Product: WW_P024

Firmware

• SDK: 23
• Release: 6.0.1
• Incremental: WW_P024-V5.9.4-20170613

Server error logs

No response

Additional information

No response

[LeSpocky]

Server has a certificate issued by Lets Encrypt, which is not trusted by Android 6 (anymore).

[joshtrichards]

Sorry, but we don't support:

• Client 3.25.0
• Nextcloud Server 25 (has reached end-of-life)
• Android 6

https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#mobile-apps