diff --git a/src/plugins/comicsPlayer/plugin.js b/src/plugins/comicsPlayer/plugin.js
index 6f53d28786..139704f69f 100644
--- a/src/plugins/comicsPlayer/plugin.js
+++ b/src/plugins/comicsPlayer/plugin.js
@@ -241,6 +241,9 @@ export class ComicsPlayer {
     }
 }
 
+// the comic book archive supports any kind of image format as it's just a zip archive
+const supportedFormats = ['jpg', 'png', 'avif', 'gif', 'bmp', 'dib', 'tiff', 'tif'];
+
 class ArchiveSource {
     constructor(url) {
         this.url = url;
@@ -259,14 +262,11 @@ class ArchiveSource {
         this.raw = await this.archive.getFilesArray();
         await this.archive.extractFiles();
 
-        // the comic book archive supports any kind of image format as it's just a zip archive
-        const supportedFormats = ['jpg', 'png', 'avif', 'gif', 'bmp', 'dib', 'tiff', 'tif'];
-
         let files = await this.archive.getFilesArray();
         files = files.filter((file) => {
             const name = file.file.name;
             const index = name.lastIndexOf('.');
-            return supportedFormats.includes(name.substr(index + 1));
+            return index !== 1 && supportedFormats.includes(name.slice(index + 1));
         });
         files.sort((a, b) => {
             if (a.file.name < b.file.name) {