diff --git a/android/app/src/main/assets/js/polyfill-onscrollend.js b/android/app/src/main/assets/js/polyfill-onscrollend.js
new file mode 100644
index 0000000000..0382a0c160
--- /dev/null
+++ b/android/app/src/main/assets/js/polyfill-onscrollend.js
@@ -0,0 +1,91 @@
+/* eslint-disable eslint-comments/no-unlimited-disable */
+/* eslint-disable */
+'use strict';
+(() => {
+  function f(i, o, r, s = !1) {
+    if (!(o in i) || typeof r != 'function') return !1;
+    let t = i[o];
+    return (
+      (i[o] = function (...e) {
+        return (
+          s || t.apply(this, e), (t = t.bind(this)), r.apply(this, [t, ...e])
+        );
+      }),
+      !0
+    );
+  }
+  if (typeof window == 'undefined') throw 'Not in a browser.';
+  var p = 'onscrollend' in window;
+  if (!p) {
+    let s = function (e, u, l) {
+        if (u !== 'scrollend') {
+          e.apply(this, [u, l]);
+          return;
+        }
+        let c = this,
+          n = i.get(c);
+        if (!n) {
+          let d;
+          (n = {
+            scrollFn: () => {
+              clearTimeout(d),
+                (d = setTimeout(() => {
+                  l();
+                }, 100));
+            },
+            handlers: [l],
+          }),
+            e.apply(c, ['scroll', n.scrollFn, !1]),
+            i.set(c, n);
+        }
+      },
+      t = function (e, u, l) {
+        if (u !== 'scrollend') {
+          e.apply(this, [u, l]);
+          return;
+        }
+        let c = this,
+          n = i.get(c);
+        if (n) {
+          if (
+            (typeof n.scrollFn == 'function' &&
+              e.apply(this, ['scroll', n.scrollFn]),
+            typeof l == 'undefined')
+          )
+            n.handlers = [];
+          else {
+            let d = n.handlers.indexOf(l);
+            d > -1 && n.handlers.splice(d, 1);
+          }
+          n.handlers.length === 0 && i.delete(c);
+        }
+      };
+    (a = s), (w = t);
+    let i = new WeakMap(),
+      o = null,
+      r = null;
+    f(window, 'addEventListener', s, !0),
+      f(window, 'removeEventListener', t, !0),
+      Object.defineProperty(window, 'onscrollend', {
+        set: e => {
+          (typeof e != 'function' || o) &&
+            t.call(window, window.removeEventListener, 'scrollend', o),
+            (o = e),
+            e && s.call(window, window.addEventListener, 'scrollend', e);
+        },
+        get: () => o,
+      }),
+      f(document, 'addEventListener', s, !0),
+      f(document, 'removeEventListener', t, !0),
+      Object.defineProperty(document, 'onscrollend', {
+        set: e => {
+          (typeof e != 'function' || r) &&
+            t.call(document, document.removeEventListener, 'scrollend', r),
+            (r = e),
+            e && s.call(document, document.addEventListener, 'scrollend', e);
+        },
+        get: () => r,
+      });
+  }
+  var a, w;
+})();
diff --git a/src/screens/library/LibraryScreen.tsx b/src/screens/library/LibraryScreen.tsx
index d84c130068..f9a4b89011 100644
--- a/src/screens/library/LibraryScreen.tsx
+++ b/src/screens/library/LibraryScreen.tsx
@@ -140,7 +140,10 @@ const LibraryScreen = ({ navigation }: LibraryScreenProps) => {
   }, [currentNovels, navigation]);
 
   // If there are categories but the current index is out of bounds, set it to 0
-  if (categories.length && !categories[index]) setIndex(0);
+  if (categories.length && !categories[index]) {
+    setIndex(0);
+    return null;
+  }
 
   return (
     <SafeAreaView excludeBottom>
@@ -166,7 +169,7 @@ const LibraryScreen = ({ navigation }: LibraryScreenProps) => {
         theme={theme}
       />
 
-      {categories.length && categories[index] ? (
+      {categories.length ? (
         <LibraryTabs
           categories={categories}
           index={index}
diff --git a/src/screens/novel/components/NovelScreenButtonGroup/NovelScreenButtonGroup.tsx b/src/screens/novel/components/NovelScreenButtonGroup/NovelScreenButtonGroup.tsx
index e0e41e8e0e..8826f829fd 100644
--- a/src/screens/novel/components/NovelScreenButtonGroup/NovelScreenButtonGroup.tsx
+++ b/src/screens/novel/components/NovelScreenButtonGroup/NovelScreenButtonGroup.tsx
@@ -12,6 +12,7 @@ import { NovelScreenProps } from '@navigators/types';
 import { useTrackedNovel, useTracker } from '@hooks/persisted';
 import Animated, { ZoomIn, ZoomOut } from 'react-native-reanimated';
 import { MaterialDesignIconName } from '@type/icon';
+import { useLibraryContext } from '@components/Context/LibraryContext';
 
 const NButton = ({
   onPress,
@@ -70,6 +71,7 @@ const NovelScreenButtonGroup: React.FC<NovelScreenButtonGroupProps> = ({
 }) => {
   const { inLibrary, isLocal } = novel;
   const { navigate } = useNavigation<NovelScreenProps['navigation']>();
+  const { refreshCategories } = useLibraryContext();
   const { tracker } = useTracker();
   const { trackedNovel } = useTrackedNovel(novel.id);
 
@@ -145,6 +147,7 @@ const NovelScreenButtonGroup: React.FC<NovelScreenButtonGroupProps> = ({
           novelIds={[novel.id]}
           closeModal={closeSetCategoryModal}
           visible={setCategoryModalVisible}
+          onSuccess={refreshCategories}
         />
       )}
     </>
diff --git a/src/screens/reader/components/WebViewReader.tsx b/src/screens/reader/components/WebViewReader.tsx
index f760cdb2fd..26a3eb92e7 100644
--- a/src/screens/reader/components/WebViewReader.tsx
+++ b/src/screens/reader/components/WebViewReader.tsx
@@ -255,6 +255,7 @@ const WebViewReader: React.FC<WebViewReaderProps> = ({ onPress }) => {
                   },
                 })}
               </script>
+              <script src="${assetsUriPrefix}/js/polyfill-onscrollend.js"></script>
               <script src="${assetsUriPrefix}/js/icons.js"></script>
               <script src="${assetsUriPrefix}/js/van.js"></script>
               <script src="${assetsUriPrefix}/js/text-vibe.js"></script>