Index: src/vortex_connection.c
===================================================================
--- src/vortex_connection.c	(revision 4459)
+++ src/vortex_connection.c	(working copy)
@@ -4453,6 +4453,9 @@
 	VortexCtx                    * ctx = connection->ctx;
 #endif
 
+	/* look during the operation */
+	vortex_mutex_lock (&connection->handlers_mutex);
+
 	/* invoke full */
 	if (is_full) {
 		/* iterate over all full handlers and invoke them */
@@ -4490,6 +4493,9 @@
 
 	} /* if */
 
+	/* unlock */
+	vortex_mutex_unlock (&connection->handlers_mutex);
+
 	return;
 }