diff --git a/create_factory_debug.lua b/create_factory_debug.lua
index 4ce91fb..e4eab44 100644
--- a/create_factory_debug.lua
+++ b/create_factory_debug.lua
@@ -115,7 +115,8 @@ table.sort(names)
 
 emit("ATM10 CREATE FACTORY PERIPHERAL DEBUG")
 emit("Computer ID: " .. tostring(os.getComputerID()))
-emit("Computer label: " .. tostring(os.getComputerLabel()))
+local computerLabel = os.getComputerLabel()
+emit("Computer label: " .. tostring(computerLabel or "<not set>"))
 emit("Uptime timer/clock: " .. tostring(os.clock()))
 emit("Peripheral count: " .. tostring(#names))
 emit(string.rep("=", 72))