diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c
index 5a26102e232..229ceef7836 100644
--- a/src/libsystemd-network/sd-dhcp6-client.c
+++ b/src/libsystemd-network/sd-dhcp6-client.c
@@ -1417,7 +1417,8 @@ int sd_dhcp6_client_stop(sd_dhcp6_client *client) {
 }
 
 int sd_dhcp6_client_is_running(sd_dhcp6_client *client) {
-        assert_return(client, -EINVAL);
+        if (!client)
+                return false;
 
         return client->state != DHCP6_STATE_STOPPED;
 }
diff --git a/src/libsystemd-network/sd-ipv4acd.c b/src/libsystemd-network/sd-ipv4acd.c
index 1a9a8f10ab6..51d2b2219dd 100644
--- a/src/libsystemd-network/sd-ipv4acd.c
+++ b/src/libsystemd-network/sd-ipv4acd.c
@@ -564,7 +564,8 @@ int sd_ipv4acd_get_address(sd_ipv4acd *acd, struct in_addr *address) {
 }
 
 int sd_ipv4acd_is_running(sd_ipv4acd *acd) {
-        assert_return(acd, false);
+        if (!acd)
+                return false;
 
         return acd->state != IPV4ACD_STATE_INIT;
 }
diff --git a/src/libsystemd-network/sd-ipv4ll.c b/src/libsystemd-network/sd-ipv4ll.c
index a29279e6afc..5bf98332a9f 100644
--- a/src/libsystemd-network/sd-ipv4ll.c
+++ b/src/libsystemd-network/sd-ipv4ll.c
@@ -206,7 +206,8 @@ int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) {
 }
 
 int sd_ipv4ll_is_running(sd_ipv4ll *ll) {
-        assert_return(ll, false);
+        if (!ll)
+                return false;
 
         return sd_ipv4acd_is_running(ll->acd);
 }
diff --git a/src/libsystemd-network/sd-radv.c b/src/libsystemd-network/sd-radv.c
index 71e7a718970..cde45388b7c 100644
--- a/src/libsystemd-network/sd-radv.c
+++ b/src/libsystemd-network/sd-radv.c
@@ -81,7 +81,8 @@ sd_event *sd_radv_get_event(sd_radv *ra) {
 }
 
 int sd_radv_is_running(sd_radv *ra) {
-        assert_return(ra, false);
+        if (!ra)
+                return false;
 
         return ra->state != RADV_STATE_IDLE;
 }