Safely handle null titleName

src/all/kavita/src/eu/kanade/tachiyomi/extension/all/kavita/KavitaHelper.kt

@@ -81,6 +81,7 @@ class KavitaHelper {
             val chapterLabel = if (isWebtoon) "Episode" else "Chapter"
             val volumeLabel = if (isWebtoon) "Season" else "Volume"
 
+            if (titleName != null) {
                 name = when (type) {
                     ChapterType.Regular -> {
                         val chapterNum = formatChapterNumber(chapter)
@@ -94,10 +95,12 @@ class KavitaHelper {
                                         volumeName = volume.name.ifBlank { title },
                                     ),
                                 )}"
+
                             else ->
                                 "$volumeLabel ${formatVolumeNumber(volume)} $chapterLabel $chapterNum"
                         }
                     }
+
                     ChapterType.SingleFileVolume -> {
                         cleanChapterTitle(
                             when {
@@ -110,6 +113,7 @@ class KavitaHelper {
                             ),
                         )
                     }
+
                     ChapterType.Special -> {
                         cleanChapterTitle(
                             when {
@@ -123,6 +127,7 @@ class KavitaHelper {
                             ),
                         )
                     }
+
                     ChapterType.Chapter -> {
                         val chapterNum = formatChapterNumber(chapter)
                         when {
@@ -135,10 +140,12 @@ class KavitaHelper {
                                         volumeName = volume.name,
                                     ),
                                 )}"
+
                             else ->
                                 "$chapterLabel $chapterNum"
                         }
                     }
+
                     ChapterType.Issue -> {
                         val issueNum = chapter.number.toIntOrNull()?.toString()?.padStart(3, '0') ?: chapter.number
                         cleanChapterTitle(
@@ -154,6 +161,7 @@ class KavitaHelper {
                         )
                     }
                 }
+            }
 
             // Handle decimal chapter numbers properly
             chapter_number = when {

src/all/kavita/src/eu/kanade/tachiyomi/extension/all/kavita/dto/MangaDto.kt

@@ -246,7 +246,7 @@ data class ChapterDto(
     val pages: Int,
     val isSpecial: Boolean,
     val title: String,
-    val titleName: String = "",
+    val titleName: String?,
     val pagesRead: Int,
     val coverImageLocked: Boolean,
     val coverImage: String,