diff --git a/src/main/java/net/minestom/server/entity/Metadata.java b/src/main/java/net/minestom/server/entity/Metadata.java
index a6fcfb355..8cf0b055c 100644
--- a/src/main/java/net/minestom/server/entity/Metadata.java
+++ b/src/main/java/net/minestom/server/entity/Metadata.java
@@ -303,7 +303,7 @@ public class Metadata {
             case TYPE_CHAT:
                 return (Value<T>) Chat(Component.empty());
             case TYPE_OPTCHAT:
-                return (Value<T>) OptChat((Component) null);
+                return (Value<T>) OptChat(null);
             case TYPE_SLOT:
                 return (Value<T>) Slot(ItemStack.AIR);
             case TYPE_BOOLEAN:
diff --git a/src/main/java/net/minestom/server/extras/selfmodification/MinestomRootClassLoader.java b/src/main/java/net/minestom/server/extras/selfmodification/MinestomRootClassLoader.java
index b7dd8288d..83b96195e 100644
--- a/src/main/java/net/minestom/server/extras/selfmodification/MinestomRootClassLoader.java
+++ b/src/main/java/net/minestom/server/extras/selfmodification/MinestomRootClassLoader.java
@@ -28,7 +28,7 @@ public class MinestomRootClassLoader extends HierarchyClassLoader {
 
     public final static Logger LOGGER = LoggerFactory.getLogger(MinestomRootClassLoader.class);
 
-    private static MinestomRootClassLoader INSTANCE;
+    private static volatile MinestomRootClassLoader INSTANCE;
 
     /**
      * Classes that cannot be loaded/modified by this classloader.
diff --git a/src/main/java/net/minestom/server/map/MapColors.java b/src/main/java/net/minestom/server/map/MapColors.java
index 9dc58107b..b16695242 100644
--- a/src/main/java/net/minestom/server/map/MapColors.java
+++ b/src/main/java/net/minestom/server/map/MapColors.java
@@ -74,7 +74,7 @@ public enum MapColors {
 
     private static final ConcurrentHashMap<Integer, PreciseMapColor> rgbMap = new ConcurrentHashMap<>();
     // only used if mappingStrategy == ColorMappingStrategy.PRECISE
-    private static PreciseMapColor[] rgbArray = null;
+    private static volatile PreciseMapColor[] rgbArray = null;
 
     private static final ColorMappingStrategy mappingStrategy;
     private static final String MAPPING_ARGUMENT = "minestom.map.rgbmapping";