diff --git a/Essetre-FASTrl.mlse b/Essetre-FASTrl.mlse
index f16ee70..084fb45 100644
--- a/Essetre-FASTrl.mlse
+++ b/Essetre-FASTrl.mlse
@@ -361,7 +361,7 @@ function OnSpecialApplyDisposition()
 
    -- Determinazione delle sue dimensioni
    local b3Raw = EgtGetRawPartBBox( nCurrRawId)
-   if b3Raw:isEmpty() then
+   if not b3Raw or b3Raw:isEmpty() then
       EMC.ERR = 11
       return
    end