diff --git a/TBF/Rig/Sequences/SequenceBase.cs b/TBF/Rig/Sequences/SequenceBase.cs
index 84297d8ec..22eced42d 100644
--- a/TBF/Rig/Sequences/SequenceBase.cs
+++ b/TBF/Rig/Sequences/SequenceBase.cs
@@ -2049,7 +2049,7 @@ namespace TBF.Rig.Sequences
         /// <returns></returns>
         protected bool TestAndLogUiCmdStop(Test test, IList<Event> e)
         {
-            if (!e.Contains(Event.UiCmdStop)) return false;
+            if (e == null || !e.Contains(Event.UiCmdStop)) return false;
 
             log.FatalFormat("STOP pressed: Procedure={0}, Test={1}, State={2}",
                             (StateMachine.Procedure == null) ? "?" : StateMachine.Procedure.Name,