Merge pull request #1169 from jbenguira/patch-1

Fixed #1024

server/prometheus.js

@@ -60,7 +60,9 @@ class Prometheus {
             }
 
             try {
+                if (tlsInfo.certInfo != null) {
                     monitor_cert_days_remaining.set(this.monitorLabelValues, tlsInfo.certInfo.daysRemaining);
+                }
             } catch (e) {
                 console.error(e);
             }