diff --git a/src/GEOM/GEOM_Engine.cxx b/src/GEOM/GEOM_Engine.cxx
index 67658d480..a30887bb6 100644
--- a/src/GEOM/GEOM_Engine.cxx
+++ b/src/GEOM/GEOM_Engine.cxx
@@ -712,9 +712,7 @@ void ProcessFunction(Handle(GEOM_Function)&   theFunction,
 {
   if (theFunction.IsNull()) return;
 
-  // not to process twice
   if (theProcessed.Contains(theFunction->GetEntry())) return;
-  theProcessed.Add(theFunction->GetEntry());
 
   // pass functions, that depends on nonexisting ones
   bool doNotProcess = false;
@@ -753,6 +751,7 @@ void ProcessFunction(Handle(GEOM_Function)&   theFunction,
     theIgnoreObjs.insert(anObjEntry.ToCString());
     return;
   }
+  theProcessed.Add(theFunction->GetEntry());
 
   TCollection_AsciiString aDescr = theFunction->GetDescription();
   if(aDescr.Length() == 0) return;