diff --git a/app/src/main/java/org/schabi/newpipe/player/gesture/MainPlayerGestureListener.kt b/app/src/main/java/org/schabi/newpipe/player/gesture/MainPlayerGestureListener.kt
index 0d28f2f585b..d184282127f 100644
--- a/app/src/main/java/org/schabi/newpipe/player/gesture/MainPlayerGestureListener.kt
+++ b/app/src/main/java/org/schabi/newpipe/player/gesture/MainPlayerGestureListener.kt
@@ -161,12 +161,11 @@ class MainPlayerGestureListener(
     }
 
     override fun onScroll(
-        initialEvent: MotionEvent,
+        initialEvent: MotionEvent?,
         movingEvent: MotionEvent,
         distanceX: Float,
         distanceY: Float
     ): Boolean {
-
         if (!playerUi.isFullscreen) {
             return false
         }
@@ -176,7 +175,7 @@ class MainPlayerGestureListener(
         val navigationBarHeight = getAndroidDimenPx(player.context, "navigation_bar_height")
 
         // Do not handle this event if initially it started from status or navigation bars
-        val isTouchingStatusBar = initialEvent.y < statusBarHeight
+        val isTouchingStatusBar = initialEvent!!.y < statusBarHeight
         val isTouchingNavigationBar = initialEvent.y > (binding.root.height - navigationBarHeight)
         if (isTouchingStatusBar || isTouchingNavigationBar) {
             return false
diff --git a/app/src/main/java/org/schabi/newpipe/player/gesture/PopupPlayerGestureListener.kt b/app/src/main/java/org/schabi/newpipe/player/gesture/PopupPlayerGestureListener.kt
index a540c0ab02f..d95a6f07284 100644
--- a/app/src/main/java/org/schabi/newpipe/player/gesture/PopupPlayerGestureListener.kt
+++ b/app/src/main/java/org/schabi/newpipe/player/gesture/PopupPlayerGestureListener.kt
@@ -167,7 +167,7 @@ class PopupPlayerGestureListener(
     }
 
     override fun onFling(
-        e1: MotionEvent,
+        e1: MotionEvent?,
         e2: MotionEvent,
         velocityX: Float,
         velocityY: Float
@@ -218,12 +218,11 @@ class PopupPlayerGestureListener(
     }
 
     override fun onScroll(
-        initialEvent: MotionEvent,
+        initialEvent: MotionEvent?,
         movingEvent: MotionEvent,
         distanceX: Float,
         distanceY: Float
     ): Boolean {
-
         if (isResizing) {
             return super.onScroll(initialEvent, movingEvent, distanceX, distanceY)
         }
@@ -234,7 +233,7 @@ class PopupPlayerGestureListener(
 
         isMoving = true
 
-        val diffX = (movingEvent.rawX - initialEvent.rawX)
+        val diffX = (movingEvent.rawX - initialEvent!!.rawX)
         val posX = MathUtils.clamp(
             initialPopupX + diffX,
             0f, (playerUi.screenWidth - playerUi.popupLayoutParams.width).toFloat()
diff --git a/app/src/main/java/org/schabi/newpipe/player/notification/NotificationUtil.java b/app/src/main/java/org/schabi/newpipe/player/notification/NotificationUtil.java
index 05c2e3af6dd..3fa7c26233c 100644
--- a/app/src/main/java/org/schabi/newpipe/player/notification/NotificationUtil.java
+++ b/app/src/main/java/org/schabi/newpipe/player/notification/NotificationUtil.java
@@ -364,7 +364,7 @@ private void setLargeIcon(final NotificationCompat.Builder builder) {
         final Bitmap thumbnail = player.getThumbnail();
         if (thumbnail == null || !showThumbnail) {
             // since the builder is reused, make sure the thumbnail is unset if there is not one
-            builder.setLargeIcon(null);
+            builder.setLargeIcon((Bitmap) null);
             return;
         }
 
diff --git a/app/src/main/java/org/schabi/newpipe/views/player/CircleClipTapView.kt b/app/src/main/java/org/schabi/newpipe/views/player/CircleClipTapView.kt
index e3d14291694..8554e71943d 100644
--- a/app/src/main/java/org/schabi/newpipe/views/player/CircleClipTapView.kt
+++ b/app/src/main/java/org/schabi/newpipe/views/player/CircleClipTapView.kt
@@ -80,10 +80,10 @@ class CircleClipTapView(context: Context?, attrs: AttributeSet) : View(context,
         updatePathShape()
     }
 
-    override fun onDraw(canvas: Canvas?) {
+    override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
 
-        canvas?.clipPath(shapePath)
-        canvas?.drawPath(shapePath, backgroundPaint)
+        canvas.clipPath(shapePath)
+        canvas.drawPath(shapePath, backgroundPaint)
     }
 }