src/Pure/Isar/outer_syntax.scala

--- a/src/Pure/Isar/outer_syntax.scala	Fri Nov 07 22:33:54 2014 +0100
+++ b/src/Pure/Isar/outer_syntax.scala	Fri Nov 07 23:35:13 2014 +0100
@@ -251,7 +251,7 @@
       case "subsubsection" => Some(3)
       case _ =>
         keywords.command_kind(command.name) match {
-          case Some(kind) if Keyword.theory(kind) => Some(4)
+          case Some(kind) if Keyword.theory(kind) && kind != Keyword.THY_END => Some(4)
           case _ => None
         }
     }