diff --git a/server/session/world.go b/server/session/world.go
index 96ffe288e..5fca88d99 100644
--- a/server/session/world.go
+++ b/server/session/world.go
@@ -851,12 +851,13 @@ func (s *Session) ViewBlockUpdate(pos cube.Pos, b world.Block, layer int) {
 		Layer:             uint32(layer),
 	})
 	if v, ok := b.(world.NBTer); ok {
-		NBTData := v.EncodeNBT()
-		NBTData["x"], NBTData["y"], NBTData["z"] = int32(pos.X()), int32(pos.Y()), int32(pos.Z())
-		s.writePacket(&packet.BlockActorData{
-			Position: blockPos,
-			NBTData:  NBTData,
-		})
+		if nbtData := v.EncodeNBT(); nbtData != nil {
+			nbtData["x"], nbtData["y"], nbtData["z"] = int32(pos.X()), int32(pos.Y()), int32(pos.Z())
+			s.writePacket(&packet.BlockActorData{
+				Position: blockPos,
+				NBTData:  nbtData,
+			})
+		}
 	}
 }