diff --git a/MainWindow/Main.cs b/MainWindow/Main.cs
index 239d93b36..14d26fb00 100644
--- a/MainWindow/Main.cs
+++ b/MainWindow/Main.cs
@@ -1629,7 +1629,8 @@ private void update255_MTB(object sender, EventArgs e)
         }
         private void updateForm(object sender, EventArgs e)
         {
-            pkm.AltForm = CB_Form.SelectedIndex;
+            if (CB_Form == sender && fieldsLoaded)
+                pkm.AltForm = CB_Form.SelectedIndex;
             updateStats();
             // Repopulate Abilities if Species Form has different abilities
             setAbilityList();