diff --git a/public/js/reader.js b/public/js/reader.js
index a5d8e6b..fa66b77 100644
--- a/public/js/reader.js
+++ b/public/js/reader.js
@@ -29,14 +29,16 @@ const readerComponent = () => {
 						return {
 							id: i + 1,
 							url: `${base_url}api/page/${tid}/${eid}/${i+1}`,
-							width: d.width,
-							height: d.height,
+							width: d.width == 0 ? "100%" : d.width,
+							height: d.height == 0 ? "100%" : d.height,
 						};
 					});
 
-					const avgRatio = this.items.reduce((acc, cur) => {
+					// Note: for image types not supported by image_size.cr, the width and height will be 0, and so `avgRatio` will be `Infinity`.
+					// TODO: support more image types in image_size.cr
+					const avgRatio = dimensions.reduce((acc, cur) => {
 						return acc + cur.height / cur.width
-					}, 0) / this.items.length;
+					}, 0) / dimensions.length;
 
 					console.log(avgRatio);
 					this.longPages = avgRatio > 2;
diff --git a/src/config.cr b/src/config.cr
index dd0fbda..867b8ab 100644
--- a/src/config.cr
+++ b/src/config.cr
@@ -8,16 +8,21 @@ class Config
   property host : String = (ENV["LISTEN_HOST"]? || "0.0.0.0")
   property port : Int32 = (ENV["LISTEN_PORT"]? || 9000).to_i
   property base_url : String = (ENV["BASE_URL"]? || "/")
+  # ameba:disable Layout/LineLength
   property session_secret : String = (ENV["SESSION_SECRET"]? || "mango-session-secret")
   property library_path : String = (ENV["LIBRARY_PATH"]? || "~/mango/library")
+  # ameba:disable Layout/LineLength
   property library_cache_path : String = (ENV["LIBRARY_CACHE_PATH"]? || "~/mango/library.yml.gz")
   property db_path : String = (ENV["DB_PATH"]? || "~/mango/mango.db")
+  # ameba:disable Layout/LineLength
   property queue_db_path : String = (ENV["QUEUE_DB_PATH"]? || "~/mango/queue.db")
   property scan_interval_minutes : Int32 = (ENV["SCAN_INTERVAL"]? || 5).to_i
+  # ameba:disable Layout/LineLength
   property thumbnail_generation_interval_hours : Int32 = (ENV["THUMBNAIL_INTERVAL"]? || 24).to_i
   property log_level : String = (ENV["LOG_LEVEL"]? || "info")
   property upload_path : String = (ENV["UPLOAD_PATH"]? || "~/mango/uploads")
   property plugin_path : String = (ENV["PLUGIN_PATH"]? || "~/mango/plugins")
+  # ameba:disable Layout/LineLength
   property download_timeout_seconds : Int32 = (ENV["DOWNLOAD_TIMEOUT"]? || 30).to_i
   property cache_enabled : Bool = env_is_true?("CACHE_ENABLED", true)
   property cache_size_mbs : Int32 = (ENV["CACHE_SIZE"]? || 50).to_i
@@ -25,6 +30,7 @@ class Config
   property disable_login : Bool = env_is_true?("DISABLE_LOGIN", false)
   property default_username : String = (ENV["DEFAULT_USERNAME"]? || "")
   property auth_proxy_header_name : String = (ENV["AUTH_PROXY_HEADER"]? || "")
+  # ameba:disable Layout/LineLength
   property plugin_update_interval_hours : Int32 = (ENV["PLUGIN_UPDATE_INTERVAL"]? || 24).to_i
 
   @@singlet : Config?
diff --git a/src/library/title.cr b/src/library/title.cr
index e9873f2..9c3ad78 100644
--- a/src/library/title.cr
+++ b/src/library/title.cr
@@ -632,6 +632,16 @@ class Title
 
     if last_read_entry && last_read_entry.finished? username
       last_read_entry = last_read_entry.next_entry username
+      if last_read_entry.nil?
+        # The last entry is finished. Return the first unfinished entry
+        #   (if any)
+        sorted_entries(username).each do |e|
+          unless e.finished? username
+            last_read_entry = e
+            break
+          end
+        end
+      end
     end
 
     last_read_entry
diff --git a/src/util/util.cr b/src/util/util.cr
index ed3dc46..ce658aa 100644
--- a/src/util/util.cr
+++ b/src/util/util.cr
@@ -11,6 +11,7 @@ SUPPORTED_IMG_TYPES      = %w(
   image/avif
   image/gif
   image/svg+xml
+  image/jxl
 )
 
 def random_str
@@ -49,6 +50,7 @@ def register_mime_types
     #   defiend by Crystal in `MIME.DEFAULT_TYPES`
     ".apng" => "image/apng",
     ".avif" => "image/avif",
+    ".jxl"  => "image/jxl",
   }.each do |k, v|
     MIME.register k, v
   end