Fixed no next chapter issue. If it couldn't find a next chapter it would crash the backend

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 Saved
-.vscode
+.vscode
+.env

controllers/api.js

@@ -120,7 +120,7 @@ exports.manga = async (req, res)=>
                 }
             }
         }
-        const filteredArray = chaptersRead.filter(item => item.completely == true);
+        const filteredArray = chaptersRead.length>0?chaptersRead.filter(item => item.completely == true):chaptersRead;
         filteredArray.sort((a, b) => a.chapterNum - b.chapterNum);
         const lastCompletelyRead = filteredArray.pop();
         const sortedChapters = chaptersRead.sort((a, b) => a.chapterNum - b.chapterNum);
@@ -128,11 +128,14 @@ exports.manga = async (req, res)=>
         const lastChapterWithReadImages=sortedAndFilteredChapters.shift();
         let chapterNumToContinue = getChapterNumToContinue(lastCompletelyRead, lastChapterWithReadImages, manga.List);
         if(!manga.List.some(item=> item.num==chapterNumToContinue)) chapterNumToContinue = Math.trunc(chapterNumToContinue);
-        let index = manga.List.indexOf(manga.List.filter(item=>
-            {
-                return item.num == chapterNumToContinue
-            })[0]);
-        manga.List[index]['continue'] = true;
+        if(lastCompletelyRead  || lastChapterWithReadImages)
+        {
+            let index = manga.List.indexOf(manga.List.filter(item=>
+                {
+                    return item.num == chapterNumToContinue
+                })[0]);
+            manga.List[index]['continue'] = true;
+        }
     }
     catch (error) 
     {
@@ -140,8 +143,16 @@ exports.manga = async (req, res)=>
     }
     res.render('mangaPage.ejs', {data:{...manga, scanlator}});
 }
+/**
+ * 
+ * @param {Chapter} lastCompletelyRead 
+ * @param {Chapter} lastChapterWithReadImages 
+ * @param {ChapterList} List 
+ * @returns {Nyumber}
+ */
 function getChapterNumToContinue(lastCompletelyRead, lastChapterWithReadImages, List)
 {
+    if(!lastCompletelyRead && !lastChapterWithReadImages) return List[0].num;
     const firstIndex = List.indexOf(List.filter(item=>item.num == lastCompletelyRead.chapterNum)[0]);
     if(lastCompletelyRead)
     {