diff -r -U 3 minecraft_server\net\minecraft\advancements\PlayerAdvancements.java minecraft_server_patched\net\minecraft\advancements\PlayerAdvancements.java
--- minecraft_server\net\minecraft\advancements\PlayerAdvancements.java
+++ minecraft_server_patched\net\minecraft\advancements\PlayerAdvancements.java
@@ -119,7 +119,7 @@
 
             Stream<Entry<ResourceLocation, AdvancementProgress>> stream = map.entrySet().stream().sorted(Comparator.comparing(Entry::getValue));
 
-            for(Entry<ResourceLocation, AdvancementProgress> entry : (List)stream.collect(Collectors.toList())) {
+            for(Entry<ResourceLocation, AdvancementProgress> entry : stream.collect(Collectors.toList())) {
                Advancement advancement = this.field_192756_d.func_191949_aK().func_192778_a(entry.getKey());
                if (advancement == null) {
                   field_192753_a.warn("Ignored advancement '" + entry.getKey() + "' in progress file " + this.field_192757_e + " - it doesn't exist anymore?");