diff --git a/Ragon.Common/Sources/RagonSerializer.cs b/Ragon.Common/Sources/RagonSerializer.cs
index 6975863..059d976 100644
--- a/Ragon.Common/Sources/RagonSerializer.cs
+++ b/Ragon.Common/Sources/RagonSerializer.cs
@@ -156,6 +156,30 @@ namespace Ragon.Common
       return value;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void WriteString(string value, ushort size)
+    {
+      var stringRaw = Encoding.UTF8.GetBytes(value).AsSpan();
+      ResizeIfNeed(2 + size);
+      
+      WriteUShort((ushort) stringRaw.Length);
+      
+      var data = _data.AsSpan().Slice(_offset, size);
+      stringRaw.CopyTo(data);
+      _offset += stringRaw.Length;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public string ReadString(ushort size)
+    {
+      var lenght = ReadUShort();
+      var stringRaw = _data.AsSpan().Slice(_offset, size);
+      var strData = stringRaw.Slice(0, lenght);
+      var str = Encoding.UTF8.GetString(strData);
+      _offset += size;
+      return str;
+    }
+    
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void WriteString(string value)
     {
diff --git a/Ragon/Sources/Game/GameRoom.cs b/Ragon/Sources/Game/GameRoom.cs
index c3dbd99..8603201 100755
--- a/Ragon/Sources/Game/GameRoom.cs
+++ b/Ragon/Sources/Game/GameRoom.cs
@@ -278,6 +278,12 @@ namespace Ragon.Core
           var entityType = _serializer.ReadUShort();
           var staticId = _serializer.ReadUShort();
           var propertiesCount = _serializer.ReadUShort();
+          if (propertiesCount > 63)
+          {
+            _logger.Warn($"Allowed only 64 properties per entity. EntityType(Static) {entityType}");
+            return;
+          }
+
           var entity = new Entity(peerId, entityType, staticId, RagonAuthority.ALL, RagonAuthority.OWNER_ONLY, propertiesCount);
           for (var i = 0; i < propertiesCount; i++)
           {
@@ -322,6 +328,12 @@ namespace Ragon.Core
           var entityType = _serializer.ReadUShort();
           var propertiesCount = _serializer.ReadUShort();
           var entity = new Entity(peerId, entityType, 0, RagonAuthority.ALL, RagonAuthority.ALL, propertiesCount);
+          if (propertiesCount > 63)
+          {
+            _logger.Warn($"Allowed only 64 properties per entity. EntityType(Static) {entityType}");
+            return;
+          }
+
           for (var i = 0; i < propertiesCount; i++)
           {
             var propertySize = _serializer.ReadUShort();