diff --git a/src/me/libraryaddict/disguise/DisguiseAPI.java b/src/me/libraryaddict/disguise/DisguiseAPI.java
index 92a3c0c2..870dcd67 100644
--- a/src/me/libraryaddict/disguise/DisguiseAPI.java
+++ b/src/me/libraryaddict/disguise/DisguiseAPI.java
@@ -178,7 +178,8 @@ public class DisguiseAPI {
                 Method clear = entityTrackerEntry.getClass().getMethod("clear", ReflectionManager.getNmsClass("EntityPlayer"));
                 Method updatePlayer = entityTrackerEntry.getClass().getMethod("updatePlayer",
                         ReflectionManager.getNmsClass("EntityPlayer"));
-                for (Object player : trackedPlayers) {
+                HashSet cloned = (HashSet) trackedPlayers.clone();
+                for (Object player : cloned) {
                     if (entity instanceof Player && !((Player) getBukkitEntity.invoke(player)).canSee((Player) entity))
                         continue;
                     clear.invoke(entityTrackerEntry, player);