diff --git a/app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Collections.kt b/app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Collections.kt
index aedd8eb39..dcbecf41e 100644
--- a/app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Collections.kt
+++ b/app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Collections.kt
@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.core.util.ext
 
 import androidx.collection.ArrayMap
 import androidx.collection.ArraySet
+import org.koitharu.kotatsu.BuildConfig
 import java.util.Collections
 import java.util.EnumSet
 
@@ -57,3 +58,13 @@ inline fun <reified E : Enum<E>> Collection<E>.toEnumSet(): EnumSet<E> = if (isE
 }
 
 fun <E : Enum<E>> Collection<E>.sortedByOrdinal() = sortedBy { it.ordinal }
+
+fun <T> Iterable<T>.sortedWithSafe(comparator: Comparator<in T>): List<T> = try {
+	sortedWith(comparator)
+} catch (e: IllegalArgumentException) {
+	if (BuildConfig.DEBUG) {
+		throw e
+	} else {
+		toList()
+	}
+}
diff --git a/app/src/main/kotlin/org/koitharu/kotatsu/settings/AppearanceSettingsFragment.kt b/app/src/main/kotlin/org/koitharu/kotatsu/settings/AppearanceSettingsFragment.kt
index 202a5b371..02c1c0c2d 100644
--- a/app/src/main/kotlin/org/koitharu/kotatsu/settings/AppearanceSettingsFragment.kt
+++ b/app/src/main/kotlin/org/koitharu/kotatsu/settings/AppearanceSettingsFragment.kt
@@ -20,6 +20,7 @@ import org.koitharu.kotatsu.core.util.LocaleComparator
 import org.koitharu.kotatsu.core.util.ext.getLocalesConfig
 import org.koitharu.kotatsu.core.util.ext.postDelayed
 import org.koitharu.kotatsu.core.util.ext.setDefaultValueCompat
+import org.koitharu.kotatsu.core.util.ext.sortedWithSafe
 import org.koitharu.kotatsu.core.util.ext.toList
 import org.koitharu.kotatsu.parsers.util.names
 import org.koitharu.kotatsu.parsers.util.toTitleCase
@@ -107,7 +108,7 @@ class AppearanceSettingsFragment :
 	private fun initLocalePicker(preference: ListPreference) {
 		val locales = preference.context.getLocalesConfig()
 			.toList()
-			.sortedWith(LocaleComparator())
+			.sortedWithSafe(LocaleComparator())
 		preference.entries = Array(locales.size + 1) { i ->
 			if (i == 0) {
 				getString(R.string.automatic)
diff --git a/app/src/main/kotlin/org/koitharu/kotatsu/settings/onboard/OnboardViewModel.kt b/app/src/main/kotlin/org/koitharu/kotatsu/settings/onboard/OnboardViewModel.kt
index 529cd1392..9ded73c19 100644
--- a/app/src/main/kotlin/org/koitharu/kotatsu/settings/onboard/OnboardViewModel.kt
+++ b/app/src/main/kotlin/org/koitharu/kotatsu/settings/onboard/OnboardViewModel.kt
@@ -8,6 +8,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import org.koitharu.kotatsu.core.ui.BaseViewModel
 import org.koitharu.kotatsu.core.util.ext.map
 import org.koitharu.kotatsu.core.util.ext.mapToSet
+import org.koitharu.kotatsu.core.util.ext.sortedWithSafe
 import org.koitharu.kotatsu.explore.data.MangaSourcesRepository
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
@@ -78,7 +79,7 @@ class OnboardViewModel @Inject constructor(
 				summary = srcs.joinToString { it.title },
 				isChecked = key in selectedLocales,
 			)
-		}.sortedWith(SourceLocaleComparator())
+		}.sortedWithSafe(SourceLocaleComparator())
 	}
 
 	private class SourceLocaleComparator : Comparator<SourceLocale?> {
diff --git a/app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/catalog/SourcesCatalogViewModel.kt b/app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/catalog/SourcesCatalogViewModel.kt
index 2ac9ef081..1296ed6eb 100644
--- a/app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/catalog/SourcesCatalogViewModel.kt
+++ b/app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/catalog/SourcesCatalogViewModel.kt
@@ -18,6 +18,7 @@ import org.koitharu.kotatsu.core.ui.util.ReversibleAction
 import org.koitharu.kotatsu.core.util.LocaleComparator
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
+import org.koitharu.kotatsu.core.util.ext.sortedWithSafe
 import org.koitharu.kotatsu.explore.data.MangaSourcesRepository
 import org.koitharu.kotatsu.parsers.model.ContentType
 import org.koitharu.kotatsu.parsers.model.MangaSource
@@ -82,6 +83,6 @@ class SourcesCatalogViewModel @Inject constructor(
 	private fun getLocalesImpl(): List<Locale?> {
 		return repository.allMangaSources
 			.mapToSet { it.locale?.let(::Locale) }
-			.sortedWith(LocaleComparator())
+			.sortedWithSafe(LocaleComparator())
 	}
 }