--- a/chrome/browser/renderer_preferences_util.cc	2025-10-02 10:02:51.275119654 +0200
+++ b/chrome/browser/renderer_preferences_util.cc	2025-10-02 10:03:20.725461352 +0200
@@ -127,7 +127,8 @@
 
 #if BUILDFLAG(IS_LINUX)
   if (auto* linux_ui_theme = ui::LinuxUiTheme::GetForProfile(profile)) {
-    if (ThemeServiceFactory::GetForProfile(profile)->UsingSystemTheme()) {
+    if (ThemeServiceFactory::GetForProfile(profile) &&
+        ThemeServiceFactory::GetForProfile(profile)->UsingSystemTheme()) {
       linux_ui_theme->GetFocusRingColor(&prefs->focus_ring_color);
       linux_ui_theme->GetActiveSelectionBgColor(
           &prefs->active_selection_bg_color);