diff --git a/web/account/log-in-form.react.js b/web/account/log-in-form.react.js
--- a/web/account/log-in-form.react.js
+++ b/web/account/log-in-form.react.js
@@ -100,6 +100,10 @@
         setErrorMessage('alphanumeric usernames only');
         usernameInputRef.current?.focus();
         return;
+      } else if (password === '') {
+        setErrorMessage('password is empty');
+        usernameInputRef.current?.focus();
+        return;
       }
 
       const extraInfo = loginExtraInfo();
@@ -110,7 +114,7 @@
         ({ calendarQuery: extraInfo.calendarQuery }: LogInStartingPayload),
       );
     },
-    [dispatchActionPromise, logInAction, loginExtraInfo, username],
+    [dispatchActionPromise, logInAction, loginExtraInfo, username, password],
   );
 
   const loginButtonContent = React.useMemo(() => {