diff --git a/scenes/frame-ecm-list/scroll-ecm-list.gd b/scenes/frame-ecm-list/scroll-ecm-list.gd
index 498f0311..47506b7a 100644
--- a/scenes/frame-ecm-list/scroll-ecm-list.gd
+++ b/scenes/frame-ecm-list/scroll-ecm-list.gd
@@ -127,7 +127,10 @@ func on_interfer_new(ecm, table_index):
 
 
 func on_interfer_off(ecm, table_index):
-    $table.remove_row(table_index[ecm.ispp])
+    if not table_index.has(ecm.ispp):
+        return
+    var i_row = table_index[ecm.ispp]
+    $table.remove_row(i_row)
     rehash(table_index)
     var sel_rows: Array
     $table.get_selected_rows(sel_rows)