diff --git a/Tusker/Views/Profile Header/ProfileHeaderView.swift b/Tusker/Views/Profile Header/ProfileHeaderView.swift
index 3fc9bc6e..484c3a2d 100644
--- a/Tusker/Views/Profile Header/ProfileHeaderView.swift	
+++ b/Tusker/Views/Profile Header/ProfileHeaderView.swift	
@@ -181,7 +181,8 @@ class ProfileHeaderView: UIView {
     }
     
     @objc private func updateUIForPreferences() {
-        guard let account = mastodonController.persistentContainer.account(for: accountID) else {
+        guard let mastodonController = mastodonController,
+              let account = mastodonController.persistentContainer.account(for: accountID) else {
             fatalError("Missing cached account \(accountID!)")
         }