diff --git a/script/tern.py b/script/tern.py
index a522a6a..53dd315 100644
--- a/script/tern.py
+++ b/script/tern.py
@@ -414,6 +414,7 @@ def __ne__(self, other):
   return K
 
 def tern_rename(newName):
+  if not newName: return
   data = tern_runCommand({"type": "rename", "newName": newName}, fragments=False)
   if data is None: return