diff --git a/website/server/libs/pushNotifications.js b/website/server/libs/pushNotifications.js
index a38162bf00..267685b840 100644
--- a/website/server/libs/pushNotifications.js
+++ b/website/server/libs/pushNotifications.js
@@ -28,6 +28,11 @@ function removePushDevice (user, pushDevice) {
 export const MAX_MESSAGE_LENGTH = 300;
 
 async function sendFCMNotification (user, pushDevice, payload) {
+  if (nconf.get('FIREBASE_PROJECT_ID') === undefined || nconf.get('FIREBASE_PROJECT_ID') === '') {
+    logger.info('Will not send push notification, because Firebase is not configured.');
+    return;
+  }
+
   const messaging = admin.messaging();
   if (messaging === undefined) {
     return;
diff --git a/website/server/libs/slack.js b/website/server/libs/slack.js
index 13fabe0665..38327edce6 100644
--- a/website/server/libs/slack.js
+++ b/website/server/libs/slack.js
@@ -20,7 +20,7 @@ let flagSlack;
 let subscriptionSlack;
 
 try {
-  if (IS_TEST || IS_PRODUCTION) {
+  if ((IS_TEST || IS_PRODUCTION) && SLACK_FLAGGING_URL && SLACK_SUBSCRIPTIONS_URL) {
     flagSlack = new IncomingWebhook(SLACK_FLAGGING_URL);
     subscriptionSlack = new IncomingWebhook(SLACK_SUBSCRIPTIONS_URL);
   } else {