[gnome-chess] g_timer_elapsed: assertion 'timer != NULL' failed

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 4334c18d691a4fb003f75e5adbabe42b3185f12f
Author: Michael Catanzaro <mike catanzaro gmail com>
Date:   Sat Aug 3 16:54:52 2013 -0500

    g_timer_elapsed: assertion 'timer != NULL' failed

 src/chess-clock.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/chess-clock.vala b/src/chess-clock.vala
index 7487a58..2902799 100644
--- a/src/chess-clock.vala
+++ b/src/chess-clock.vala
@@ -162,7 +162,7 @@ public class ChessClock : Object
 
     public void unpause ()
     {
-        if (is_active)
+        if (timer == null || is_active)
             return;
 
         timer  continue ();