diff --git a/filter/config.Y b/filter/config.Y
index 69454bc3..1ab43058 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -5,6 +5,7 @@
  *
  *	Can be freely distributed and used under the terms of the GNU GPL.
  *
+	FIXME: priority of ! should be lower
  */
 
 CF_HDR
diff --git a/filter/filter.c b/filter/filter.c
index c6d7e4f1..6a4778b9 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -579,8 +579,7 @@ interpret(struct f_inst *what)
 	  break;
 	}
       }	
-      if (!t->data)
-	bug( "Impossible: no code associated!" );
+      /* It is actually possible to have t->data NULL */
       return interpret(t->data);
     }
     break;