From 2271681c575a544b3148666ae35b48794ec6a6ea Mon Sep 17 00:00:00 2001
From: Jan Petykiewicz <jan@mpxd.net>
Date: Fri, 2 Jun 2023 21:17:00 -0700
Subject: [PATCH] Only remove existing ports

---
 masque/builder/renderpather.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/masque/builder/renderpather.py b/masque/builder/renderpather.py
index 852bf2e..b97e0e6 100644
--- a/masque/builder/renderpather.py
+++ b/masque/builder/renderpather.py
@@ -430,7 +430,7 @@ class RenderPather(PortList):
                     batch.append(step)
 
                 # Opcodes which break the batch go below this line
-                if not appendable_op:
+                if not appendable_op and portspec in bb.ports:
                     del bb.ports[portspec]
 
             #If the last batch didn't end yet