if no gf is found in chart, default will be chosen by week

source/PlayState.hx

@@ -738,9 +738,20 @@ class PlayState extends MusicBeatState
 					add(stageCurtains);
 			}
 		}
-		var gfVersion:String = 'gf';
 
-		switch (SONG.gfVersion)
+		//defaults if no gf was found in chart
+		var gfCheck:String = 'gf';
+		
+		if (SONG.gfVersion == null) {
+			switch(storyWeek)
+			{
+				case 4: gfCheck = 'gf-car';
+				case 5: gfCheck = 'gf-christmas';
+				case 6: gfCheck = 'gf-pixel';
+			}
+		} else {gfCheck = SONG.gfVersion;}
+
+		switch (gfCheck)
 		{
 			case 'gf-car':
 				gfVersion = 'gf-car';