--- a/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
+++ b/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
@@ -19,7 +_,7 @@
 
     @Override
     public final void addPlayerListener(PlayerAdvancements playerAdvancements, CriterionTrigger.Listener<T> listener) {
-        playerAdvancements.criterionData.computeIfAbsent(this, managerx -> Sets.newHashSet()).add(listener); // Paper - fix PlayerAdvancements leak
+        playerAdvancements.criterionData.computeIfAbsent(this, managerx -> Sets.newConcurrentHashSet()).add(listener); // Paper - fix PlayerAdvancements leak // DivineMC - use concurrent set
     }
 
     @Override