diff --git a/lophine-server/src/main/java/fun/bm/lophine/utils/EntitiesCounterUtil.java b/lophine-server/src/main/java/fun/bm/lophine/utils/EntitiesCounterUtil.java
index d80320d..42021ce 100644
--- a/lophine-server/src/main/java/fun/bm/lophine/utils/EntitiesCounterUtil.java
+++ b/lophine-server/src/main/java/fun/bm/lophine/utils/EntitiesCounterUtil.java
@@ -91,6 +91,7 @@ public class EntitiesCounterUtil {
             Object2IntOpenHashMap<MobCategory> map = new Object2IntOpenHashMap<>();
             for (ReferenceList<Entity> data : data0.values()) {
                 for (Entity entity : GlobalEntitiesCounter.enabled ? data.copy() : data) {
+                    if (entity == null || entity.isRemoved() || !entity.isAlive()) continue;
                     // Lophine start - Copy from net/minecraft/world/level/NaturalSpawner
                     MobCategory category = entity.getType().getCategory();
                     if (category != MobCategory.MISC) {
@@ -132,6 +133,7 @@ public class EntitiesCounterUtil {
         // Lophine start - Copy from net/minecraft/world/level/NaturalSpawner
         PotentialCalculator potentialCalculator = new PotentialCalculator();
         for (Entity entity : entities) {
+            if (entity == null || entity.isRemoved() || !entity.isAlive()) continue;
             // Paper start - Only count natural spawns
             if (!entity.level().paperConfig().entities.spawning.countAllMobsForSpawning &&
                     !(entity.spawnReason == CreatureSpawnEvent.SpawnReason.NATURAL ||
diff --git a/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecordMetaData.java b/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecordMetaData.java
index 0e0fbb6..9df5f5e 100644
--- a/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecordMetaData.java
+++ b/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecordMetaData.java
@@ -26,7 +26,7 @@ public class RecordMetaData {
     public static final int CURRENT_FILE_FORMAT_VERSION = 14;
 
     public boolean singleplayer = false;
-    public String serverName = "Leaves";
+    public String serverName = "Lophine";
     public int duration = 0;
     public long date;
     public String mcversion;
@@ -37,4 +37,22 @@ public class RecordMetaData {
     public int selfId = -1;
 
     public Set<UUID> players = new HashSet<>();
+
+    public RecordMetaData copy() {
+        RecordMetaData ret = new RecordMetaData();
+        synchronized (this) {
+            ret.singleplayer = this.singleplayer;
+            ret.serverName = this.serverName;
+            ret.duration = this.duration;
+            ret.date = this.date;
+            ret.mcversion = this.mcversion;
+            ret.fileFormat = this.fileFormat;
+            ret.fileFormatVersion = this.fileFormatVersion;
+            ret.protocol = this.protocol;
+            ret.generator = this.generator;
+            ret.selfId = this.selfId;
+            ret.players = new HashSet<>(this.players);
+        }
+        return ret;
+    }
 }
diff --git a/lophine-server/src/main/java/org/leavesmc/leaves/replay/Recorder.java b/lophine-server/src/main/java/org/leavesmc/leaves/replay/Recorder.java
index e986671..66c2806 100644
--- a/lophine-server/src/main/java/org/leavesmc/leaves/replay/Recorder.java
+++ b/lophine-server/src/main/java/org/leavesmc/leaves/replay/Recorder.java
@@ -195,7 +195,9 @@ public class Recorder extends Connection {
             }
             case ClientboundAddEntityPacket packet1 -> {
                 if (packet1.getType() == EntityType.PLAYER) {
-                    metaData.players.add(packet1.getUUID());
+                    synchronized (metaData) {
+                        metaData.players.add(packet1.getUUID());
+                    }
                     saveMetadata();
                 }
             }
diff --git a/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecorderOption.java b/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecorderOption.java
index 2ff2e7f..6762e23 100644
--- a/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecorderOption.java
+++ b/lophine-server/src/main/java/org/leavesmc/leaves/replay/RecorderOption.java
@@ -27,7 +27,7 @@ import java.util.List;
 public class RecorderOption {
 
     public int recordDistance = -1;
-    public String serverName = "Leaves";
+    public String serverName = "Lophine";
     public RecordWeather forceWeather = null;
     public int forceDayTime = -1;
     public boolean ignoreChat = false;
diff --git a/lophine-server/src/main/java/org/leavesmc/leaves/replay/ReplayFile.java b/lophine-server/src/main/java/org/leavesmc/leaves/replay/ReplayFile.java
index 47324bd..0f6eeb9 100644
--- a/lophine-server/src/main/java/org/leavesmc/leaves/replay/ReplayFile.java
+++ b/lophine-server/src/main/java/org/leavesmc/leaves/replay/ReplayFile.java
@@ -123,9 +123,10 @@ public class ReplayFile {
         data.fileFormatVersion = RecordMetaData.CURRENT_FILE_FORMAT_VERSION;
         data.protocol = SharedConstants.getCurrentVersion().protocolVersion();
         data.generator = ProtocolUtils.buildProtocolVersion("replay");
+        RecordMetaData dataCopy = data.copy();
 
         try (Writer writer = new OutputStreamWriter(new FileOutputStream(metaFile), StandardCharsets.UTF_8)) {
-            writer.write(META_GSON.toJson(data));
+            writer.write(META_GSON.toJson(dataCopy));
         }
     }