diff --git a/radsecproxy.c b/radsecproxy.c
index a62d3e6..778d3b7 100644
--- a/radsecproxy.c
+++ b/radsecproxy.c
@@ -537,7 +537,8 @@ void sendrq(struct request *rq) {
     if (rq->from)
 	rmclientrq(rq, rq->msg->id);
     freerq(rq);
-    pthread_mutex_unlock(&to->newrq_mutex);
+    if (to)
+        pthread_mutex_unlock(&to->newrq_mutex);
     removeclientrqs_sendrq_freeserver_lock(0);
 }