Fix updating "MultiSelectListPreference" with non-existing selected values

CHANGELOG.md

@@ -61,6 +61,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Browse**) Fix showing only nsfw sources in the browse source page when the "show nsfw" setting is disabled
 - (**Manga/Library**) Fix mark as read/unread option not being disabled for manga without any chapters
 - (**Manga/Library**) Fix delete/download option not being disabled for manga without any chapters
+- (**Source**) Fix changing configuration settings with multi option selection where a selected option does not exist anymore. (E.g. Komgas "Default libraries" setting, still having a library selected that has been deleted)
 
 ## [20260509.01] (r3147) - 2026-05-09
 

src/features/source/configuration/components/MultiSelectListPreference.tsx

@@ -120,16 +120,20 @@ export function MultiSelectListPreference(props: MultiSelectListPreferenceProps)
     }, [currentValue]);
 
     const findEntriesOf = (values?: string[] | null) =>
-        values?.map((value) => {
+        values
+            ?.map((value) => {
                 const idx = entryValues.indexOf(value);
                 return entries[idx];
-        }) ?? [];
+            })
+            .filter((value) => typeof value === 'string') ?? [];
 
     const findEntryValuesOf = (values?: string[] | null) =>
-        values?.map((value) => {
+        values
+            ?.map((value) => {
                 const idx = entries.indexOf(value);
                 return entryValues[idx];
-        }) ?? [];
+            })
+            .filter((value) => typeof value === 'string') ?? [];
 
     const getSummary = () => summary;