diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5634d556e..67675d3e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - Fixed Kitsu login and other requests that send data failing with "Failed to bypass Cloudflare" ([@AntsyLich](https://github.com/AntsyLich))
 - Fixed tracker start date being off by a day when adding tracking to an entry with read history in some timezones ([@hazptr](https://github.com/hazptr)) ([#4049](https://github.com/mihonapp/mihon/pull/4049))
 - Fixed the paged reader crashing when moving to another chapter after a wide page of a neighbouring chapter was split ([@AntsyLich](https://github.com/AntsyLich))
+- Fixed a crash when opening the filters of a source with an invalid filter ([@AntsyLich](https://github.com/AntsyLich))
 
 ## [v0.21.1] - 2026-10-12
 ### Fixed
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/SourceFilterDialog.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/SourceFilterDialog.kt
index 6ff7c6087..82e573dfe 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/SourceFilterDialog.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/SourceFilterDialog.kt
@@ -169,7 +169,7 @@ private fun Int.toTriStateFilter(): TriState {
         Filter.TriState.STATE_IGNORE -> TriState.DISABLED
         Filter.TriState.STATE_INCLUDE -> TriState.ENABLED_IS
         Filter.TriState.STATE_EXCLUDE -> TriState.ENABLED_NOT
-        else -> throw IllegalStateException("Unknown TriState state: $this")
+        else -> TriState.DISABLED
     }
 }
 
diff --git a/presentation-core/src/main/java/tachiyomi/presentation/core/components/SettingsItems.kt b/presentation-core/src/main/java/tachiyomi/presentation/core/components/SettingsItems.kt
index b60665626..ca367add7 100644
--- a/presentation-core/src/main/java/tachiyomi/presentation/core/components/SettingsItems.kt
+++ b/presentation-core/src/main/java/tachiyomi/presentation/core/components/SettingsItems.kt
@@ -300,7 +300,7 @@ fun SelectItem(
                     vertical = SettingsItemsPaddings.Vertical,
                 ),
             label = { Text(text = label) },
-            value = options[selectedIndex].toString(),
+            value = options.getOrNull(selectedIndex)?.toString().orEmpty(),
             onValueChange = {},
             readOnly = true,
             singleLine = true,