From eb667118cfe31801dc1327b5d03ded4497bd2a84 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Wed, 2 Oct 2019 22:02:57 +0200
Subject: [PATCH] If there are no controls, just skip creating the controls
 thread.

---
 src/sharedspice.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/sharedspice.c b/src/sharedspice.c
index c6f55f44a..cabfd9928 100644
--- a/src/sharedspice.c
+++ b/src/sharedspice.c
@@ -442,9 +442,14 @@ sighandler_sharedspice(int num)
 void
 exec_controls(wordlist *newcontrols)
 {
-    if (newcontrols) {
+    if (newcontrols && newcontrols->wl_word && !eq(newcontrols->wl_word,"")) {
         shcontrols = newcontrols;
     }
+    else {
+        tid2 = 0;
+        return;
+    }
+
 #ifdef THREADS
 #ifdef HAVE_LIBPTHREAD
     cont_condition = FALSE;