Resolve #1122

app/src/main/java/com/hippo/ehviewer/FavouriteStatusRouter.kt

@@ -34,8 +34,8 @@ class FavouriteStatusRouter {
         return id
     }
 
-    fun restoreDataMap(id: Int): MutableMap<Long, GalleryInfo> {
-        return maps.remove(id)!!
+    fun restoreDataMap(id: Int): MutableMap<Long, GalleryInfo>? {
+        return maps.remove(id)
     }
 
     fun modifyFavourites(gid: Long, slot: Int) {

app/src/main/java/com/hippo/ehviewer/ui/legacy/GalleryInfoContentHelper.kt

@@ -77,8 +77,7 @@ abstract class GalleryInfoContentHelper : ContentHelper() {
         val id = bundle.getInt(KEY_DATA_MAP, IntIdGenerator.INVALID_ID)
         if (id != IntIdGenerator.INVALID_ID) {
             val router = EhApplication.favouriteStatusRouter
-            val map = router.restoreDataMap(id)
-            this.map = map
+            router.restoreDataMap(id)?.let { this.map = it }
         }
         return super.restoreInstanceState(state)
     }