diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2de2b09..d6b20ecf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -59,6 +59,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Reader**) Fix infinite scrolling sometimes not opening previous/next chapter
 - (**Reader**) Fix preserving scroll position with RTL reading direction and a language that is read RTL
 - (**Browse**) Fix showing only nsfw sources in the browse source page when the "show nsfw" setting is disabled
+- (**Manga**) Fix mark as read/unread option not being disabled for manga without any chapters
 
 ## [20260509.01] (r3147) - 2026-05-09
 
diff --git a/src/features/manga/services/Mangas.ts b/src/features/manga/services/Mangas.ts
index 566bb1e5..a0d37b75 100644
--- a/src/features/manga/services/Mangas.ts
+++ b/src/features/manga/services/Mangas.ts
@@ -144,15 +144,15 @@ export class Mangas {
     }
 
     static isUnread({ unreadCount, chapters: { totalCount } }: MangaUnreadInfo): boolean {
-        return unreadCount === totalCount;
+        return totalCount > 0 && unreadCount === totalCount;
     }
 
     static getUnread<Mangas extends MangaUnreadInfo>(mangas: Mangas[]): Mangas[] {
         return mangas.filter(Mangas.isUnread);
     }
 
-    static isFullyRead({ unreadCount }: MangaUnreadInfo): boolean {
-        return unreadCount === 0;
+    static isFullyRead({ unreadCount, chapters: { totalCount } }: MangaUnreadInfo): boolean {
+        return totalCount > 0 && unreadCount === 0;
     }
 
     static getFullyRead<Mangas extends MangaUnreadInfo>(mangas: Mangas[]): Mangas[] {
@@ -160,7 +160,11 @@ export class Mangas {
     }
 
     static isPartiallyRead(manga: MangaUnreadInfo): boolean {
-        return !Mangas.isUnread(manga) && !Mangas.isFullyRead(manga);
+        const {
+            chapters: { totalCount },
+        } = manga;
+
+        return totalCount > 0 && !Mangas.isUnread(manga) && !Mangas.isFullyRead(manga);
     }
 
     static getPartiallyRead<Mangas extends MangaUnreadInfo>(mangas: Mangas[]): Mangas[] {