diff --git a/webui.py b/webui.py
index 24c5f4a..e50e464 100644
--- a/webui.py
+++ b/webui.py
@@ -163,9 +163,9 @@ def set_ai_level(value, nid, ai_slots):
         "Master": 5,
         "Impossible": 6,
     }
-    ai_slots[:] = [
-        (nation_id, ai_level) for nation_id, ai_level in ai_slots if nation_id != nid
-    ]
+    for ai in ai_slots:
+        if ai[0] == nid:
+            ai_slots.remove(ai)
     if value == "Human":
         return