diff --git a/utils/resedit/space.py b/utils/resedit/space.py
index 4c3beb9..b2e5268 100644
--- a/utils/resedit/space.py
+++ b/utils/resedit/space.py
@@ -721,6 +721,9 @@ class Space:
   Add or remove jumps from a star system.
   """
   def __jump_add(self, wgt=None, event=None):
+    if self.space_sel == self.cur_system: # Can't add to self.
+      return
+
     if self.space_sel in self.systems.keys() and self.cur_system in self.systems.keys():
       self.systems[self.cur_system]["jumps"].append(self.space_sel)
       self.systems[self.space_sel]["jumps"].append(self.cur_system)