PaperMC/nms-patches/TileEntityCommand.patch

--- a/net/minecraft/server/TileEntityCommand.java
+++ b/net/minecraft/server/TileEntityCommand.java
@@ -3,6 +3,9 @@
 public class TileEntityCommand extends TileEntity {
 
     private final CommandBlockListenerAbstract a = new CommandBlockListenerAbstract() {
+        {
+            sender = new org.bukkit.craftbukkit.command.CraftBlockCommandSender(this); // CraftBukkit - add sender
+        }
         public BlockPosition getChunkCoordinates() {
             return TileEntityCommand.this.position;
         }