From ac8f2923e5fa5fda5605f7f1f50961ea49b04b54 Mon Sep 17 00:00:00 2001
From: arkon <eugcheung94@gmail.com>
Date: Sat, 23 May 2020 15:19:17 -0400
Subject: [PATCH] Handle empty thumbnail_url when refreshing covers

---
 .../eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt  | 4 ++--
 app/src/main/java/eu/kanade/tachiyomi/util/MangaExtensions.kt | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt b/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt
index 9dab85fe6..3fa56fda8 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt
@@ -337,8 +337,8 @@ class LibraryUpdateService(
         if (preferences.autoUpdateMetadata()) {
             source.fetchMangaDetails(manga)
                 .map { updatedManga ->
-                    // Avoid "losing" covers
-                    if (updatedManga.thumbnail_url != null) {
+                    // Avoid "losing" existing cover
+                    if (!updatedManga.thumbnail_url.isNullOrEmpty()) {
                         manga.prepUpdateCover(coverCache, updatedManga, false)
                     } else {
                         updatedManga.thumbnail_url = manga.thumbnail_url
diff --git a/app/src/main/java/eu/kanade/tachiyomi/util/MangaExtensions.kt b/app/src/main/java/eu/kanade/tachiyomi/util/MangaExtensions.kt
index 9dcadcfec..e4d4419e8 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/util/MangaExtensions.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/util/MangaExtensions.kt
@@ -17,6 +17,9 @@ fun Manga.prepUpdateCover(coverCache: CoverCache, remoteManga: SManga, refreshSa
     // Never refresh covers if the new url is null, as the current url has possibly become invalid
     val newUrl = remoteManga.thumbnail_url ?: return
 
+    // Never refresh covers if the url is empty to avoid "losing" existing covers
+    if (newUrl.isEmpty()) return
+
     if (!refreshSameUrl && thumbnail_url == newUrl) return
 
     when {