diff --git a/src/main/java/net/minestom/server/entity/EntityView.java b/src/main/java/net/minestom/server/entity/EntityView.java
index 967517978..f9cc581d4 100644
--- a/src/main/java/net/minestom/server/entity/EntityView.java
+++ b/src/main/java/net/minestom/server/entity/EntityView.java
@@ -96,7 +96,8 @@ final class EntityView {
 
     public void forManuals(@NotNull Consumer<Player> consumer) {
         synchronized (mutex) {
-            this.manualViewers.forEach(consumer);
+            Set<Player> manualViewersCopy = Set.copyOf(this.manualViewers);
+            manualViewersCopy.forEach(consumer);
         }
     }