diff --git a/docker/Dockerfile b/docker/Dockerfile
index b0e3bf0..d12ca06 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM keppel.eu-de-1.cloud.sap/ccloud-dockerhub-mirror/library/node:11.12-alpine
+FROM keppel.eu-de-1.cloud.sap/ccloud-dockerhub-mirror/library/node:14-alpine
 
 LABEL source_repository="https://github.com/sapcc/supernova"
 
diff --git a/docker/Dockerfile.test b/docker/Dockerfile.test
index 088d793..53d5169 100644
--- a/docker/Dockerfile.test
+++ b/docker/Dockerfile.test
@@ -1,14 +1,14 @@
-FROM keppel.eu-de-1.cloud.sap/ccloud-dockerhub-mirror/library/node:11.12-alpine
+FROM keppel.eu-de-1.cloud.sap/ccloud-dockerhub-mirror/library/node:14-alpine
 LABEL source_repository="https://github.com/sapcc/supernova"
 
 RUN apk --no-cache add git ca-certificates bash make nano sudo
 
 RUN apk update && apk upgrade && \
-    echo @edge http://nl.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories && \
-    echo @edge http://nl.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories && \
-    apk add --no-cache \
-      chromium@edge \
-      nss@edge
+  echo @edge http://nl.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories && \
+  echo @edge http://nl.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories && \
+  apk add --no-cache \
+  chromium@edge \
+  nss@edge
 
 # Tell Puppeteer to skip installing Chrome. We'll be using the installed package.
 ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
diff --git a/server/lib/AlertManagerApi.js b/server/lib/AlertManagerApi.js
index 87d78e1..23c4c1b 100644
--- a/server/lib/AlertManagerApi.js
+++ b/server/lib/AlertManagerApi.js
@@ -14,13 +14,19 @@ let activeIndex = 0
 let activeUrl = endpoints[activeIndex]
 
 const url = (path) => `${activeUrl}/${path}`
-const userCert = fs.readFileSync(
-  process.env.PROMETHEUS_USER_CERT_LOCATION ||
-    path.join(certFilePath, "sso.crt")
-)
-const userKey = fs.readFileSync(
-  process.env.PROMETHEUS_USER_KEY_LOCATION || path.join(certFilePath, "sso.key")
-)
+let userCert, userKey
+try {
+  userCert = fs.readFileSync(
+    process.env.PROMETHEUS_USER_CERT_LOCATION ||
+      path.join(certFilePath, "sso.crt")
+  )
+  userKey = fs.readFileSync(
+    process.env.PROMETHEUS_USER_KEY_LOCATION ||
+      path.join(certFilePath, "sso.key")
+  )
+} catch (e) {
+  console.error(e)
+}
 
 const alerts = async (params = {}) =>
   axios