1.21.5

Co-authored-by: Bjarne Koll <git@lynxplay.dev>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: Lulu13022002 <41980282+Lulu13022002@users.noreply.github.com>
Co-authored-by: MiniDigger | Martin <admin@minidigger.dev>
Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>
Co-authored-by: Noah van der Aa <ndvdaa@gmail.com>
Co-authored-by: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>
Co-authored-by: Tamion <70228790+notTamion@users.noreply.github.com>
Co-authored-by: Warrior <50800980+Warriorrrr@users.noreply.github.com>

paper-api/src/main/java/org/bukkit/entity/AreaEffectCloud.java

@@ -223,7 +223,7 @@ public interface AreaEffectCloud extends Entity {
      * @param type the potion effect type to check for
      * @return true if the potion has this effect
      */
-    boolean hasCustomEffect(@Nullable PotionEffectType type);
+    boolean hasCustomEffect(@NotNull PotionEffectType type);
 
     /**
      * Removes all custom potion effects from this cloud.