diff --git a/plugins/dynamic-security/clients.c b/plugins/dynamic-security/clients.c
index d74aea44..3708af2a 100644
--- a/plugins/dynamic-security/clients.c
+++ b/plugins/dynamic-security/clients.c
@@ -1058,7 +1058,10 @@ int dynsec_clients__process_add_role(cJSON *j_responses, struct mosquitto *conte
 		return MOSQ_ERR_SUCCESS;
 	}
 
-	dynsec_rolelist__client_add(client, role, priority);
+	if(dynsec_rolelist__client_add(client, role, priority) != MOSQ_ERR_SUCCESS){
+		dynsec__command_reply(j_responses, context, "addClientRole", "Internal error", correlation_data);
+		return MOSQ_ERR_UNKNOWN;
+	}
 	dynsec__config_save();
 	dynsec__command_reply(j_responses, context, "addClientRole", NULL, correlation_data);
 
diff --git a/plugins/dynamic-security/groups.c b/plugins/dynamic-security/groups.c
index c6d6a129..c4fa70b1 100644
--- a/plugins/dynamic-security/groups.c
+++ b/plugins/dynamic-security/groups.c
@@ -151,7 +151,10 @@ int dynsec_groups__process_add_role(cJSON *j_responses, struct mosquitto *contex
 	mosquitto_log_printf(MOSQ_LOG_INFO, "dynsec: %s/%s | addGroupRole | groupname=%s | rolename=%s | priority=%d",
 			admin_clientid, admin_username, groupname, rolename, priority);
 
-	dynsec_rolelist__group_add(group, role, priority);
+	if(dynsec_rolelist__group_add(group, role, priority) != MOSQ_ERR_SUCCESS){
+		dynsec__command_reply(j_responses, context, "addGroupRole", "Internal error", correlation_data);
+		return MOSQ_ERR_UNKNOWN;
+	}
 	dynsec__config_save();
 	dynsec__command_reply(j_responses, context, "addGroupRole", NULL, correlation_data);