diff --git a/ChangeLog.txt b/ChangeLog.txt
index bf6c09b238..c2d788b97c 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -10,6 +10,11 @@
      * Change, ! Fix, % Optimization, + Addition, - Removal, ; Comment
  */
 
+2017-05-04 14:48 UTC+0200 Przemyslaw Czerpak (druzus/at/poczta.onet.pl)
+  * src/compiler/hbcomp.c
+    ! restored protection against multiple free of the same expression
+      I removed by mistake in one of my recent commits.
+
 2017-05-03 09:10 UTC Viktor Szakats (vszakats users.noreply.github.com)
   * *
     * copyright name cleanups
diff --git a/src/compiler/hbcomp.c b/src/compiler/hbcomp.c
index 5dffd69dde..edf6baa342 100644
--- a/src/compiler/hbcomp.c
+++ b/src/compiler/hbcomp.c
@@ -82,6 +82,8 @@ static void hb_compExprDealloc( HB_COMP_DECL, PHB_EXPR pExpr )
       }
       hb_xfree( pExpItm );
    }
+   else
+      pExpr->ExprType = HB_ET_NONE;
 }
 
 static PHB_EXPR hb_compExprNew( HB_COMP_DECL, HB_EXPRTYPE iType )