diff --git a/File_Format_Library/FileFormats/Layout/Common.cs b/File_Format_Library/FileFormats/Layout/Common.cs
index 1efb5f35..248dd6c0 100644
--- a/File_Format_Library/FileFormats/Layout/Common.cs
+++ b/File_Format_Library/FileFormats/Layout/Common.cs
@@ -62,7 +62,7 @@ namespace LayoutBXLYT
 
                 name = value;
 
-                if (LayoutFile != null)
+                if (LayoutFile != null && !LayoutFile.PaneLookup.ContainsKey(name))
                     LayoutFile.PaneLookup.Add(name, this);
             }
         }