diff --git a/lib/modules/webserver/server.js b/lib/modules/webserver/server.js
index 53eda52c3..361e67ec9 100644
--- a/lib/modules/webserver/server.js
+++ b/lib/modules/webserver/server.js
@@ -47,7 +47,10 @@ class Server {
         ("http://" + canonicalHost(this.hostname) +
           ":" + this.port).bold.underline.green, this.port);
       if (!opened) {
-        opn(`http://${canonicalHost(this.hostname)}:${this.port}`);
+        // fail silently, e.g. in a docker container, by cacthing promise
+        // rejection w/ a noop
+        opn(`http://${canonicalHost(this.hostname)}:${this.port}`)
+          .catch(function () {});
         opened = true;
       }
     });