diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/SearchableNucleusController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/SearchableNucleusController.kt
index 15f677bbc0..22410419dd 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/SearchableNucleusController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/SearchableNucleusController.kt
@@ -134,12 +134,12 @@ abstract class SearchableNucleusController<VB : ViewBinding, P : BasePresenter<*
 
         searchItem.setOnActionExpandListener(
             object : MenuItem.OnActionExpandListener {
-                override fun onMenuItemActionExpand(item: MenuItem?): Boolean {
+                override fun onMenuItemActionExpand(item: MenuItem): Boolean {
                     onSearchMenuItemActionExpand(item)
                     return true
                 }
 
-                override fun onMenuItemActionCollapse(item: MenuItem?): Boolean {
+                override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
                     val localSearchView = searchItem.actionView as SearchView
 
                     // if it is blank the flow event won't trigger so we would stay in a COLLAPSING state
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 1aaf592015..b7578fb2d6 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
@@ -386,7 +386,7 @@ class LibraryController(
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
         createOptionsMenu(menu, inflater, R.menu.library, R.id.action_search)
         // Mutate the filter icon because it needs to be tinted and the resource is shared.
-        menu.findItem(R.id.action_filter).icon.mutate()
+        menu.findItem(R.id.action_filter).icon?.mutate()
     }
 
     fun search(query: String) {
@@ -412,7 +412,7 @@ class LibraryController(
         // Tint icon if there's a filter active
         if (settingsSheet.filters.hasActiveFilters()) {
             val filterColor = activity!!.getResourceColor(R.attr.colorFilterActive)
-            filterItem.icon.setTint(filterColor)
+            filterItem.icon?.setTint(filterColor)
         }
     }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderPageImageView.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderPageImageView.kt
index 336cd57ae3..404cb04da2 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderPageImageView.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderPageImageView.kt
@@ -311,7 +311,7 @@ open class ReaderPageImageView @JvmOverloads constructor(
                             return true
                         }
 
-                        override fun onSingleTapConfirmed(e: MotionEvent?): Boolean {
+                        override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                             this@ReaderPageImageView.onViewClicked()
                             return super.onSingleTapConfirmed(e)
                         }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonFrame.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonFrame.kt
index db711efbbe..323cf0f63f 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonFrame.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonFrame.kt
@@ -44,7 +44,7 @@ class WebtoonFrame(context: Context) : FrameLayout(context) {
      * Scale listener used to delegate events to the recycler view.
      */
     inner class ScaleListener : ScaleGestureDetector.SimpleOnScaleGestureListener() {
-        override fun onScaleBegin(detector: ScaleGestureDetector?): Boolean {
+        override fun onScaleBegin(detector: ScaleGestureDetector): Boolean {
             recycler?.onScaleBegin()
             return true
         }
@@ -63,13 +63,13 @@ class WebtoonFrame(context: Context) : FrameLayout(context) {
      * Fling listener used to delegate events to the recycler view.
      */
     inner class FlingListener : GestureDetector.SimpleOnGestureListener() {
-        override fun onDown(e: MotionEvent?): Boolean {
+        override fun onDown(e: MotionEvent): Boolean {
             return true
         }
 
         override fun onFling(
-            e1: MotionEvent?,
-            e2: MotionEvent?,
+            e1: MotionEvent,
+            e2: MotionEvent,
             velocityX: Float,
             velocityY: Float,
         ): Boolean {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsMainController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsMainController.kt
index 9076efd14e..91bf2ecdc5 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsMainController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsMainController.kt
@@ -106,13 +106,13 @@ class SettingsMainController : BasicComposeController() {
 
         searchItem.setOnActionExpandListener(
             object : MenuItem.OnActionExpandListener {
-                override fun onMenuItemActionExpand(item: MenuItem?): Boolean {
+                override fun onMenuItemActionExpand(item: MenuItem): Boolean {
                     preferences.lastSearchQuerySearchSettings().set("") // reset saved search query
                     router.pushController(SettingsSearchController())
                     return true
                 }
 
-                override fun onMenuItemActionCollapse(item: MenuItem?): Boolean {
+                override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
                     return true
                 }
             },
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/search/SettingsSearchController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/search/SettingsSearchController.kt
index e87346390d..52b6c959c6 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/search/SettingsSearchController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/search/SettingsSearchController.kt
@@ -50,11 +50,11 @@ class SettingsSearchController : ComposeController<SettingsSearchPresenter>() {
 
         searchItem.setOnActionExpandListener(
             object : MenuItem.OnActionExpandListener {
-                override fun onMenuItemActionExpand(item: MenuItem?): Boolean {
+                override fun onMenuItemActionExpand(item: MenuItem): Boolean {
                     return true
                 }
 
-                override fun onMenuItemActionCollapse(item: MenuItem?): Boolean {
+                override fun onMenuItemActionCollapse(item: MenuItem): Boolean {
                     router.popCurrentController()
                     return false
                 }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/widget/TachiyomiBottomNavigationView.kt b/app/src/main/java/eu/kanade/tachiyomi/widget/TachiyomiBottomNavigationView.kt
index 6ed163a2c2..4447cd96dd 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/widget/TachiyomiBottomNavigationView.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/widget/TachiyomiBottomNavigationView.kt
@@ -87,7 +87,7 @@ class TachiyomiBottomNavigationView @JvmOverloads constructor(
             .setDuration(duration)
             .applySystemAnimatorScale(context)
             .setListener(object : AnimatorListenerAdapter() {
-                override fun onAnimationEnd(animation: Animator?) {
+                override fun onAnimationEnd(animation: Animator) {
                     currentAnimator = null
                     postInvalidate()
                 }