diff --git a/public/script.js b/public/script.js
index a160d723b..4665ab038 100644
--- a/public/script.js
+++ b/public/script.js
@@ -5543,21 +5543,20 @@ function openCharacterWorldPopup() {
         const fileName = getCharaFilename(chid);
         const tempExtraBooks = selectedWorlds.map((index) => world_names[index]).filter((e) => e !== undefined);
 
-        const existingCharLore = charLore.find((e) => e.name === fileName);
-        if (existingCharLore) {
-            if (tempExtraBooks.length === 0) {
-                charLore.splice(existingCharLore, 1);
-            } else {
-                existingCharLore.extraBooks = tempExtraBooks;
-            }
-        } else {
+        const existingCharIndex = charLore.findIndex((e) => e.name === fileName);
+        if (existingCharIndex === -1) {
             const newCharLoreEntry = {
                 name: fileName,
                 extraBooks: tempExtraBooks
             }
 
             charLore.push(newCharLoreEntry);
+        } else if (tempExtraBooks.length === 0) {
+            charLore.splice(existingCharIndex, 1);
+        } else {
+            charLore[existingCharIndex].extraBooks = tempExtraBooks;
         }
+
         Object.assign(world_info, { charLore: charLore });
         saveSettingsDebounced();
     }
diff --git a/public/scripts/world-info.js b/public/scripts/world-info.js
index 81df9197f..c292127e8 100644
--- a/public/scripts/world-info.js
+++ b/public/scripts/world-info.js
@@ -250,16 +250,18 @@ function displayWorldEntries(name, data) {
             return;
         }
 
-        const existingCharLores = world_info.charLore?.filter((e) => e.extraBooks.includes(name));
-        if (existingCharLores && existingCharLores.length > 0) {
-            existingCharLores.forEach((charLore) => {
-                const tempCharLore = charLore.extraBooks.filter((e) => e !== name);
-                if (tempCharLore.length === 0) {
-                    world_info.charLore.splice(charLore, 1);
-                } else {
-                    charLore.extraBooks = tempCharLore;
+        if (world_info.charLore) {
+            world_info.charLore.forEach((charLore, index) => {
+                if (charLore.extraBooks?.includes(name)) {
+                    const tempCharLore = charLore.extraBooks.filter((e) => e !== name);
+                    if (tempCharLore.length === 0) {
+                        world_info.charLore.splice(index, 1);
+                    } else {
+                        charLore.extraBooks = tempCharLore;
+                    }
                 }
             });
+
             saveSettingsDebounced();
         }