Index: modules/proxy/mod_proxy_balancer.c
===================================================================
--- modules/proxy/mod_proxy_balancer.c	(revision 1630072)
+++ modules/proxy/mod_proxy_balancer.c	(working copy)
@@ -104,7 +104,11 @@ static int init_balancer_members(proxy_server_conf
         }
         ap_proxy_initialize_worker_share(conf, workers, s);
         ap_proxy_initialize_worker(workers, s);
-        if (!worker_is_initialized) {
+        /* If the worker is already initialized but standalone only, the lb
+         * parameters are nul, we have to init them once here, particularly
+         * lbfactor which would cause a division by 0 with bytraffic.
+         */
+        if (!worker_is_initialized || !workers->s->lbfactor) {
             /* Set to the original configuration */
             workers->s->lbstatus = workers->s->lbfactor =
             (workers->lbfactor ? workers->lbfactor : 1);