From 3ec3721266774c445b89df85ac1aa93c7e3d458d Mon Sep 17 00:00:00 2001
From: Sam Caldwell <samcaldwell@utexas.edu>
Date: Tue, 23 Feb 2016 16:08:49 -0500
Subject: [PATCH] make sure meta-action is an action

---
 prospect/core.rkt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/prospect/core.rkt b/prospect/core.rkt
index 88c9d92..e9b7d70 100644
--- a/prospect/core.rkt
+++ b/prospect/core.rkt
@@ -382,7 +382,9 @@
                         [(entry (in-list patches))]
                 (match-define (cons label event) entry)
                 (send-event/guard event label w))
-              meta-action))
+              (if (action? meta-action)
+                  meta-action
+                  '())))
 
 ;; PID Exception Network -> Network
 (define (disable-process cw pid exn)