diff --git a/py/node/format.py b/py/node/format.py
index d476148..5ca1105 100644
--- a/py/node/format.py
+++ b/py/node/format.py
@@ -44,5 +44,6 @@ class PromptUtilitiesJoinStringList(BaseNode):
     FUNCTION = "join"
 
     def join(self, separator, **kwargs):
-        result = separator.join(kwargs.values())
+        # join without empty strings.
+        result = separator.join([s for s in kwargs.values() if s])
         return (result,)
\ No newline at end of file