diff --git a/src/browser/pages/error.html b/src/browser/pages/error.html
index 9e6dd0b9..302b202a 100644
--- a/src/browser/pages/error.html
+++ b/src/browser/pages/error.html
@@ -21,9 +21,7 @@
     <div class="center-container">
       <div class="error-display">
         <h2 class="header">{{ERROR_HEADER}}</h2>
-        <div class="body">
-          {{ERROR_BODY}}
-        </div>
+        <div class="body">{{ERROR_BODY}}</div>
         <div class="links">
           <a class="link" href="{{BASE}}{{TO}}">go home</a>
         </div>
diff --git a/src/node/cli.ts b/src/node/cli.ts
index 22c65dbf..e9b7e3d2 100644
--- a/src/node/cli.ts
+++ b/src/node/cli.ts
@@ -360,6 +360,9 @@ export async function readConfigFile(configPath?: string): Promise<Args> {
   const config = yaml.safeLoad(configFile.toString(), {
     filename: configPath,
   })
+  if (!config || typeof config === "string") {
+    throw new Error(`invalid config: ${config}`)
+  }
 
   // We convert the config file into a set of flags.
   // This is a temporary measure until we add a proper CLI library.