diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
index 4187d9f6c..8aca99622 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
@@ -253,7 +253,7 @@ class LibraryController(
             }
             .launchIn(viewScope)
 
-        (activity!! as MainActivity).fixViewToBottom(binding.actionToolbar)
+        (activity as? MainActivity)?.fixViewToBottom(binding.actionToolbar)
     }
 
     override fun onChangeStarted(handler: ControllerChangeHandler, type: ControllerChangeType) {
@@ -266,7 +266,7 @@ class LibraryController(
 
     override fun onDestroyView(view: View) {
         destroyActionModeIfNeeded()
-        (activity!! as MainActivity).clearFixViewToBottom(binding.actionToolbar)
+        (activity as? MainActivity)?.clearFixViewToBottom(binding.actionToolbar)
         binding.actionToolbar.destroy()
         adapter?.onDestroy()
         adapter = null
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt
index 508f6c940..0012a6228 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt
@@ -342,7 +342,7 @@ class MangaController :
             }
             .launchIn(viewScope)
 
-        (activity!! as MainActivity).fixViewToBottom(binding.actionToolbar)
+        (activity as? MainActivity)?.fixViewToBottom(binding.actionToolbar)
 
         settingsSheet = ChaptersSettingsSheet(router, presenter) { group ->
             if (group is ChaptersSettingsSheet.Filter.FilterGroup) {
@@ -429,7 +429,7 @@ class MangaController :
 
     override fun onDestroyView(view: View) {
         destroyActionModeIfNeeded()
-        (activity!! as MainActivity).clearFixViewToBottom(binding.actionToolbar)
+        (activity as? MainActivity)?.clearFixViewToBottom(binding.actionToolbar)
         binding.actionToolbar.destroy()
         mangaInfoAdapter = null
         chaptersHeaderAdapter = null
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesController.kt
index 73960a235..16c51c6a4 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesController.kt
@@ -109,12 +109,12 @@ class UpdatesController :
             }
             .launchIn(viewScope)
 
-        (activity!! as MainActivity).fixViewToBottom(binding.actionToolbar)
+        (activity as? MainActivity)?.fixViewToBottom(binding.actionToolbar)
     }
 
     override fun onDestroyView(view: View) {
         destroyActionModeIfNeeded()
-        (activity!! as MainActivity).clearFixViewToBottom(binding.actionToolbar)
+        (activity as? MainActivity)?.clearFixViewToBottom(binding.actionToolbar)
         binding.actionToolbar.destroy()
         adapter = null
         super.onDestroyView(view)