Index: tol/btol/bgrammar/graacc.cpp
===================================================================
--- tol/btol/bgrammar/graacc.cpp	(revision ddf7a6ccf0a5f18fa412f30193bdd546db27a8c3)
+++ tol/btol/bgrammar/graacc.cpp	(revision b2879edf1cc2c60874a4592979acf2aa0e7ec79b)
@@ -447,5 +447,5 @@
     {
       found = Code(obj).Operator();
-      g = found->Grammar();
+      if(found) { g = found->Grammar(); }
     }
     if(found &&