1 files changed, 1 insertions, 0 deletions
diff --git a/src/lb.cpp b/src/lb.cpp
index e0c2c04..7b3339c 100644
--- a/src/lb.cpp
+++ b/src/lb.cpp
@@ -52,6 +52,7 @@ void zmq::lb_t::attach (writer_t *pipe_)
 
 void zmq::lb_t::terminate ()
 {
+    zmq_assert (!terminating);
     terminating = true;
 
     if (pipes.empty ()) {