diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/data/DataSource.kt b/core/src/main/java/org/kiwix/kiwixmobile/core/data/DataSource.kt
index 392b11134..db64071d2 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/data/DataSource.kt
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/data/DataSource.kt
@@ -44,6 +44,6 @@ interface DataSource {
 
   fun saveBookmark(bookmark: BookmarkItem): Completable
   fun deleteBookmarks(bookmarks: List<BookmarkItem>): Completable
-  fun deleteBookmark(bookmarkUrl: String): Completable
+  fun deleteBookmark(bookmarkUrl: String): Completable?
   fun booksOnDiskAsListItems(): Flowable<List<BooksOnDiskListItem>>
 }
diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/data/Repository.kt b/core/src/main/java/org/kiwix/kiwixmobile/core/data/Repository.kt
index bc2e8f609..e5bfb6e0b 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/data/Repository.kt
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/data/Repository.kt
@@ -115,7 +115,7 @@ class Repository @Inject internal constructor(
     Completable.fromAction { bookmarksDao.deleteBookmarks(bookmarks) }
       .subscribeOn(io)
 
-  override fun deleteBookmark(bookmarkUrl: String): Completable =
+  override fun deleteBookmark(bookmarkUrl: String): Completable? =
     Completable.fromAction { bookmarksDao.deleteBookmark(bookmarkUrl) }
       .subscribeOn(io)
 }
diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/main/MainRepositoryActions.kt b/core/src/main/java/org/kiwix/kiwixmobile/core/main/MainRepositoryActions.kt
index 855605496..c4728b402 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/main/MainRepositoryActions.kt
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/main/MainRepositoryActions.kt
@@ -41,6 +41,6 @@ class MainRepositoryActions @Inject constructor(private val dataSource: DataSour
 
   fun deleteBookmark(bookmarkUrl: String) {
     dataSource.deleteBookmark(bookmarkUrl)
-      .subscribe({}, { e -> Log.e(TAG, "Unable to delete bookmark", e) })
+      ?.subscribe({}, { e -> Log.e(TAG, "Unable to delete bookmark", e) })
   }
 }