diff --git a/app/src/main/java/at/bitfire/davdroid/settings/AccountSettings.kt b/app/src/main/java/at/bitfire/davdroid/settings/AccountSettings.kt
index 120b9523b60751e25826fff1f03481550506329f..e84c119c40675a9374a133d812a1df23fddc719c 100644
--- a/app/src/main/java/at/bitfire/davdroid/settings/AccountSettings.kt
+++ b/app/src/main/java/at/bitfire/davdroid/settings/AccountSettings.kt
@@ -223,7 +223,7 @@ class AccountSettings(
             context.getString(R.string.account_type), context.getString(R.string.google_account_type), context.getString(R.string.eelo_account_type) ->
                 account = argAccount
             else ->
-                throw IllegalArgumentException("Account type not supported")
+                throw IllegalArgumentException("Account type not supported. AccountType: ${argAccount.type}")
         }
 
         // synchronize because account migration must only be run one time
diff --git a/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncUtils.kt b/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncUtils.kt
index c9e9bc5abb6fa76389898738f8ecefab7ed86278..4b3278562109fd86ada6967424d54641e40a2ada 100644
--- a/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncUtils.kt
+++ b/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncUtils.kt
@@ -34,6 +34,7 @@ import dagger.hilt.EntryPoint
 import dagger.hilt.InstallIn
 import dagger.hilt.android.EntryPointAccessors
 import dagger.hilt.components.SingletonComponent
+import java.util.logging.Level
 
 object SyncUtils {
 
@@ -111,8 +112,18 @@ object SyncUtils {
                 val isSyncable = ContentResolver.getIsSyncable(account, providerName.authority)     // may be -1 (unknown state)
                 val shallBeSyncable = hasCalDAV && providerName == currentProvider
                 if ((shallBeSyncable && isSyncable != 1) || (!shallBeSyncable && isSyncable != 0)) {
-                    // enable/disable sync
-                    setSyncableFromSettings(context, account, providerName.authority, shallBeSyncable)
+                    try {
+                        // enable/disable sync
+                        setSyncableFromSettings(
+                            context,
+                            account,
+                            providerName.authority,
+                            shallBeSyncable
+                        )
+                    } catch (e: IllegalArgumentException) {
+                        Logger.log.log(Level.WARNING, "Account type not supported", e)
+                        continue
+                    }
 
                     // if sync has just been enabled: check whether additional permissions are required
                     if (shallBeSyncable && !PermissionUtils.havePermissions(context, providerName.permissions))
@@ -138,6 +149,7 @@ object SyncUtils {
                 settings.setSyncInterval(authority, interval)
             } catch (e: InvalidAccountException) {
                 // account has already been removed
+                Logger.log.log(Level.WARNING, "Account is not present", e)
             }
         } else {
             Logger.log.info("Disabling $authority sync for $account")