diff --git a/turtle.lua b/turtle.lua
index 6a9528b..f0c1c67 100644
--- a/turtle.lua
+++ b/turtle.lua
@@ -913,7 +913,13 @@ local function processMessage(message)
     
     if message.command then
         print("  Command: " .. message.command)
-        print("  Available handlers: " .. textutils.serialize(table.keys or function(t) local k={} for n in pairs(t) do table.insert(k,n) end return k end)(commands))
+        -- Don't try to serialize the commands table - it contains functions!
+        -- Just list the command names
+        local availableCommands = {}
+        for cmdName, _ in pairs(commands) do
+            table.insert(availableCommands, cmdName)
+        end
+        print("  Available handlers: " .. table.concat(availableCommands, ", "))
         
         local handler = commands[message.command]
         if handler then