Fix #12764: Crash when opening Detailed performance rating window with no companies. (#12765)

(cherry picked from commit df1b6a933bc0208e4b62d6ee44359a15fa2354fe)

src/graph_gui.cpp

@@ -1806,8 +1806,10 @@ struct PerformanceRatingDetailWindow : Window {
 		}
 
 		/* Make sure the widget is lowered */
+		if (this->company != INVALID_COMPANY) {
 			this->LowerWidget(WID_PRD_COMPANY_FIRST + this->company);
 		}
+	}
 };
 
 CompanyID PerformanceRatingDetailWindow::company = INVALID_COMPANY;