diff --git a/respip/respip.c b/respip/respip.c
index 32cf98a72..83603bb42 100644
--- a/respip/respip.c
+++ b/respip/respip.c
@@ -305,7 +305,7 @@ respip_enter_rr_wol(struct regional* region, struct resp_addr* raddr,
 		char* rrstr = dname_rdata_to_str(NULL, 0, rrtype,
 			rrclass, ttl, rdata_wol, rdata_len);
 		log_err("CNAME response-ip data (%s) can not co-exist with other "
-			"response-ip data for netblock %s", rrstr, netblockstr);
+			"response-ip data for netblock %s", (rrstr?rrstr:"<out of memory>"), netblockstr);
 		free(rrstr);
 		return 0;
 	} else if (raddr->data &&
@@ -313,7 +313,7 @@ respip_enter_rr_wol(struct regional* region, struct resp_addr* raddr,
 		char* rrstr = dname_rdata_to_str(NULL, 0, rrtype,
 			rrclass, ttl, rdata_wol, rdata_len);
 		log_err("response-ip data (%s) can not be added; CNAME response-ip "
-			"data already in place for netblock %s", rrstr, netblockstr);
+			"data already in place for netblock %s", (rrstr?rrstr:"<out of memory>"), netblockstr);
 		free(rrstr);
 		return 0;
 	} else if((rrtype != LDNS_RR_TYPE_CNAME) &&
@@ -322,7 +322,7 @@ respip_enter_rr_wol(struct regional* region, struct resp_addr* raddr,
 		char* rrstr = dname_rdata_to_str(NULL, 0, rrtype,
 			rrclass, ttl, rdata_wol, rdata_len);
 		log_err("response-ip data %s record type does not correspond "
-			"to netblock %s address family", rrstr, netblockstr);
+			"to netblock %s address family", (rrstr?rrstr:"<out of memory>"), netblockstr);
 		free(rrstr);
 		return 0;
 	}
diff --git a/services/localzone.c b/services/localzone.c
index 18d8a64f0..cd15b0f24 100644
--- a/services/localzone.c
+++ b/services/localzone.c
@@ -697,7 +697,7 @@ local_zone_enter_rr_wol(struct local_zone* z, uint8_t* nm, size_t nmlen,
 			char* rrstr = dname_rdata_to_str(nm, nmlen, rrtype,
 				rrclass, ttl, rdata_wol, rdata_len);
 			log_err("local-data '%s' in redirect zone must not "
-				"coexist with %s local-data", rrstr, othertype);
+				"coexist with %s local-data", (rrstr?rrstr:"<out of memory>"), othertype);
 			free(rrstr);
 			return 0;
 		}
@@ -722,7 +722,7 @@ local_zone_enter_rr_wol(struct local_zone* z, uint8_t* nm, size_t nmlen,
 	if(rr_is_duplicate_wol(pd, rdata_wol, rdata_len)) {
 		char* rrstr = dname_rdata_to_str(nm, nmlen, rrtype,
 			rrclass, ttl, rdata_wol, rdata_len);
-		verbose(VERB_ALGO, "ignoring duplicate RR: %s", rrstr);
+		verbose(VERB_ALGO, "ignoring duplicate RR: %s", (rrstr?rrstr:"<out of memory>"));
 		free(rrstr);
 		return 1;
 	}
@@ -730,7 +730,7 @@ local_zone_enter_rr_wol(struct local_zone* z, uint8_t* nm, size_t nmlen,
 		char* rrstr = dname_rdata_to_str(nm, nmlen, rrtype,
 			rrclass, ttl, rdata_wol, rdata_len);
 		log_warn("RRset %s has more than %d records, record ignored",
-			rrstr, LOCALZONE_RRSET_COUNT_MAX);
+			(rrstr?rrstr:"<out of memory>"), LOCALZONE_RRSET_COUNT_MAX);
 		free(rrstr);
 		return 1;
 	}
diff --git a/services/rpz.c b/services/rpz.c
index 43ae97328..ed68e5f00 100644
--- a/services/rpz.c
+++ b/services/rpz.c
@@ -711,7 +711,7 @@ rpz_insert_local_zones_trigger(struct local_zones* lz, uint8_t* dname,
 			if(duplicate) {
 				char* rrstr = dname_rdata_to_str(dname, dnamelen, rrtype,
 					rrclass, ttl, rdata, rdata_len);
-				verbose(VERB_ALGO, "rpz: skipping duplicate record: %s", rrstr);
+				verbose(VERB_ALGO, "rpz: skipping duplicate record: %s", (rrstr?rrstr:"<out of memory>"));
 				free(rrstr);
 				free(dname);
 				lock_rw_unlock(&lz->lock);
@@ -732,7 +732,7 @@ rpz_insert_local_zones_trigger(struct local_zones* lz, uint8_t* dname,
 	if(z != NULL && a != RPZ_LOCAL_DATA_ACTION) {
 		char* rrstr = dname_rdata_to_str(dname, dnamelen, rrtype,
 			rrclass, ttl, rdata, rdata_len);
-		verbose(VERB_ALGO, "rpz: skipping duplicate record: %s", rrstr);
+		verbose(VERB_ALGO, "rpz: skipping duplicate record: %s", (rrstr?rrstr:"<out of memory>"));
 		free(rrstr);
 		free(dname);
 		lock_rw_unlock(&lz->lock);
@@ -982,7 +982,7 @@ rpz_clientip_insert_trigger_rr(struct clientip_synthesized_rrset* set, struct so
 		rrstr = dname_rdata_to_str(NULL, 0, rrtype, rrclass, ttl,
 			rdata, rdata_len);
 		log_err("rpz: unexpected: unable to insert %s: %s/%d %s",
-			"client ip address", as, net, rrstr);
+			"client ip address", as, net, (rrstr?rrstr:"<out of memory>"));
 		free(rrstr);
 		return 0;
 	}