fix: check index exists.

androidApp/src/main/java/bou/amine/apps/readerforselfossv2/android/ReaderActivity.kt

@@ -161,12 +161,14 @@ class ReaderActivity :
                     override fun onPageSelected(position: Int) {
                         super.onPageSelected(position)
 
-                        if (allItems[position].starred) {
-                            canRemoveFromFavorite()
-                        } else {
-                            canFavorite()
+                        if (!allItems.isNullOrEmpty() && allItems.size >= position) {
+                            if (allItems[position].starred) {
+                                canRemoveFromFavorite()
+                            } else {
+                                canFavorite()
+                            }
+                            readItem(allItems[position])
                         }
-                        readItem(allItems[position])
                     }
                 },
             )