diff --git a/src/gui/gsc_info_window.cpp b/src/gui/gsc_info_window.cpp
index d3d217b..8530a04 100644
--- a/src/gui/gsc_info_window.cpp
+++ b/src/gui/gsc_info_window.cpp
@@ -2446,8 +2446,9 @@ gboolean GscInfoWindow::test_idle_callback(void* data)
 			if (!result_main_msg.empty()) {  // Highlight in red
 				std::string alert_color;
 				// Use the same color as Alert level warnings for consistency
-				app_property_get_label_highlight_color(WarningLevel::Alert, alert_color);
-				result_main_msg = "<span color=\"" + alert_color + "\">"s + result_main_msg + "</span>";
+				if (app_property_get_label_highlight_color(WarningLevel::Alert, alert_color) && !alert_color.empty()) {
+					result_main_msg = "<span color=\"" + alert_color + "\">"s + result_main_msg + "</span>";
+				}
 			}
 			result_details_msg += "\n"s + _("Check the Self-Test Log for more information.");
 			break;