Don't use then with await.

server/notification-providers/promosms.js

@@ -24,12 +24,12 @@ class PromoSMS extends NotificationProvider {
                 "sender": notification.promosmsSenderName
             };
 
-            await axios.post("https://promosms.com/api/rest/v3_2/sms", data, config).then(resp => {
+            let resp = await axios.post("https://promosms.com/api/rest/v3_2/sms", data, config);
+
             if (resp.data.response.status !== 0) {
                 let error = "Something gone wrong. Api returned " + resp.data.response.status + ".";
                 this.throwGeneralAxiosError(error);
             }
-            });
             
             return okMsg;
         } catch (error) {