diff --git a/role_base.js b/role_base.js
index 843d491..7245c3c 100644
--- a/role_base.js
+++ b/role_base.js
@@ -4,10 +4,9 @@ var name = 'Creep';
 function run(creep) { }
 
 function spawn(spawnPoint, newBody, newName){
-	if(newBody === 'undefined') newBody = body;
-	if(newName === 'undefined') newName = name;
-
-	spawnPoint.spawnCreep(newBody, newName + Game.time,
+	if(typeof newBody === 'undefined') newBody = body;
+	if(typeof newName === 'undefined') newName = name;
+    spawnPoint.spawnCreep(newBody, newName + Game.time,
 		{memory : {role : newName}
 	});
 }