diff --git a/utils/resedit/space.py b/utils/resedit/space.py
index 2861d36..73222b1 100644
--- a/utils/resedit/space.py
+++ b/utils/resedit/space.py
@@ -808,7 +808,7 @@ class Space:
 
   def __exterior_sel(self, wgt=None, event=None):
     space = self.__pwidget("comExterior").get_active_text()
-    if self.cur_planet != "":
+    if self.cur_planet != "" and space != "None":
       self.planets[self.cur_planet]["GFX"]["exterior"] = space
       self.__pupdate()