diff --git a/LuaLibs/BeamExec.lua b/LuaLibs/BeamExec.lua
index a039856..f352374 100644
--- a/LuaLibs/BeamExec.lua
+++ b/LuaLibs/BeamExec.lua
@@ -1761,7 +1761,7 @@ local function GetCombinationListFromMatrix( ProcessingsOnPart, Part, bReProcess
                   local dMaxNotClampableLength = 0
                   for nRotation = 1, 4 do
                      -- si considera solo rotazione attiva
-                     if string.sub( Part.CombinationList[i].sBitIndexCombination, nRotation, nRotation) == '1' then
+                     if string.sub( Part.CombinationList[i].sBitIndexCombination, nRotation, nRotation) == '1' and ( ProcessingsOnPart.Rotation[nRotation+nOffsetIndex][nProc].nFlg > 0) then
                         dMaxNotClampableLengthHead = max( ProcessingsOnPart.Rotation[nRotation+nOffsetIndex][nProc].NotClampableLength.dNotClampableLengthHead, dMaxNotClampableLengthHead)
                         dMaxNotClampableLengthTail = max( ProcessingsOnPart.Rotation[nRotation+nOffsetIndex][nProc].NotClampableLength.dNotClampableLengthTail, dMaxNotClampableLengthTail)
                      end