diff --git a/src/func_getattr_ff.cpp b/src/func_getattr_ff.cpp
index 1b0e4c3a..a04741c3 100644
--- a/src/func_getattr_ff.cpp
+++ b/src/func_getattr_ff.cpp
@@ -44,5 +44,7 @@ Func2::GetAttrFF::operator()(const Branches  &branches_,
       return rv;
     }
 
+  __builtin_trap();
+
   return err;
 }