diff --git a/include/types/backend.h b/include/types/backend.h
index 8672bd2..fd66e40 100644
--- a/include/types/backend.h
+++ b/include/types/backend.h
@@ -134,7 +134,7 @@
 	struct lb_fwlc fwlc;
 	struct lb_chash chash;
 	struct lb_fas fas;
-	/* Call backs for some actions. Some may be NULL (thus should be ignored). */
+	/* Call backs for some actions. Any of them may be NULL (thus should be ignored). */
 	void (*update_server_eweight)(struct server *);  /* to be called after eweight change */
 	void (*set_server_status_up)(struct server *);   /* to be called after status changes to UP */
 	void (*set_server_status_down)(struct server *); /* to be called after status changes to DOWN */
diff --git a/src/checks.c b/src/checks.c
index 78ec4ad..febf77e 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -390,7 +390,8 @@
 
 		s->last_change = now.tv_sec;
 		s->state &= ~(SRV_RUNNING | SRV_GOINGDOWN);
-		s->proxy->lbprm.set_server_status_down(s);
+		if (s->proxy->lbprm.set_server_status_down)
+			s->proxy->lbprm.set_server_status_down(s);
 
 		if (s->onmarkeddown & HANA_ONMARKEDDOWN_SHUTDOWNSESSIONS)
 			shutdown_sessions(s);
@@ -476,7 +477,8 @@
 			}
 			task_schedule(s->warmup, tick_add(now_ms, MS_TO_TICKS(MAX(1000, s->slowstart / 20))));
 		}
-		s->proxy->lbprm.set_server_status_up(s);
+		if (s->proxy->lbprm.set_server_status_up)
+			s->proxy->lbprm.set_server_status_up(s);
 
 		/* check if we can handle some connections queued at the proxy. We
 		 * will take as many as we can handle.
@@ -521,7 +523,8 @@
 	int xferred;
 
 	s->state |= SRV_GOINGDOWN;
-	s->proxy->lbprm.set_server_status_down(s);
+	if (s->proxy->lbprm.set_server_status_down)
+		s->proxy->lbprm.set_server_status_down(s);
 
 	/* we might have sessions queued on this server and waiting for
 	 * a connection. Those which are redispatchable will be queued
@@ -558,7 +561,8 @@
 	int xferred;
 
 	s->state &= ~SRV_GOINGDOWN;
-	s->proxy->lbprm.set_server_status_up(s);
+	if (s->proxy->lbprm.set_server_status_up)
+		s->proxy->lbprm.set_server_status_up(s);
 
 	/* check if we can handle some connections queued at the proxy. We
 	 * will take as many as we can handle.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index b95418e..4b051d7 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -989,10 +989,14 @@
 			/* static LB algorithms are a bit harder to update */
 			if (px->lbprm.update_server_eweight)
 				px->lbprm.update_server_eweight(sv);
-			else if (sv->eweight)
-				px->lbprm.set_server_status_up(sv);
-			else
-				px->lbprm.set_server_status_down(sv);
+			else if (sv->eweight) {
+				if (px->lbprm.set_server_status_up)
+					px->lbprm.set_server_status_up(sv);
+			}
+			else {
+				if (px->lbprm.set_server_status_down)
+					px->lbprm.set_server_status_down(sv);
+			}
 
 			return 1;
 		}