diff --git a/src/Add-on/LookOverBoardInfos/LookOverBoardInfosTool.ts b/src/Add-on/LookOverBoardInfos/LookOverBoardInfosTool.ts
index 057e7e16a..beefe8a3d 100644
--- a/src/Add-on/LookOverBoardInfos/LookOverBoardInfosTool.ts
+++ b/src/Add-on/LookOverBoardInfos/LookOverBoardInfosTool.ts
@@ -104,7 +104,7 @@ class LookOverBoardInfosTool
                     for (let objId of ids)
                     {
                         let gd = objId.Object;
-                        if (!gd.IsErase)
+                        if (!gd?.IsErase)
                         {
                             if (gd instanceof CylinderHole)
                                 switch (gd.Type)