Fix Variation Editor Crash

source/funkin/backend/chart/Chart.hx

@@ -83,6 +83,24 @@ class Chart {
 		return data;
 	}
 
+	inline public static function defaultChartMetaFields(data:ChartMetaData):ChartMetaData {
+		data.setFieldDefault("displayName", data.name);
+
+		data.setFieldDefault("bpm", Flags.DEFAULT_BPM);
+		data.setFieldDefault("beatsPerMeasure", Flags.DEFAULT_BEATS_PER_MEASURE);
+		data.setFieldDefault("stepsPerBeat", Flags.DEFAULT_STEPS_PER_BEAT);
+		data.setFieldDefault("icon", Flags.DEFAULT_HEALTH_ICON);
+		data.setFieldDefault("coopAllowed", Flags.DEFAULT_COOP_ALLOWED);
+		data.setFieldDefault("opponentModeAllowed", Flags.DEFAULT_OPPONENT_MODE_ALLOWED);
+		data.setFieldDefault("instSuffix", "");
+		data.setFieldDefault("vocalsSuffix", "");
+		data.setFieldDefault("needsVoices", true);
+		data.setFieldDefault("difficulties", []);
+		data.setFieldDefault("variants", []);
+
+		return data;
+	}
+
 	public static function loadChartMeta(songName:String, ?variant:String, fromMods:Bool = true, includeMetaVariations = true):ChartMetaData {
 		var defaultPath = Paths.file('songs/$songName/meta.json'), isVariant = false;
 		var data:ChartMetaData = null, paths = (variant == null || variant == '') ? [defaultPath] : [Paths.file('songs/$songName/meta-$variant.json'), defaultPath];
@@ -109,19 +127,7 @@ class Chart {
 		if (isVariant) data.variant = variant;
 		else data.variant = null;
 
-		data.setFieldDefault("displayName", data.name);
-
-		data.setFieldDefault("bpm", Flags.DEFAULT_BPM);
-		data.setFieldDefault("beatsPerMeasure", Flags.DEFAULT_BEATS_PER_MEASURE);
-		data.setFieldDefault("stepsPerBeat", Flags.DEFAULT_STEPS_PER_BEAT);
-		data.setFieldDefault("icon", Flags.DEFAULT_HEALTH_ICON);
-		data.setFieldDefault("coopAllowed", Flags.DEFAULT_COOP_ALLOWED);
-		data.setFieldDefault("opponentModeAllowed", Flags.DEFAULT_OPPONENT_MODE_ALLOWED);
-		data.setFieldDefault("instSuffix", "");
-		data.setFieldDefault("vocalsSuffix", "");
-		data.setFieldDefault("needsVoices", true);
-		data.setFieldDefault("difficulties", []);
-		data.setFieldDefault("variants", []);
+		defaultChartMetaFields(data);
 
 		if (data.difficulties.length <= 0) {
 			var path = 'songs/$songName/charts/';
@@ -283,7 +289,6 @@ class Chart {
 			var eventsPath = '$songPath/events.json', events = filterEventsForSaving(chart.events, false, true);
 
 			if (events.length != 0) CoolUtil.safeSaveFile(eventsPath, Json.stringify({events: events}, null, prettyPrint));
-			else if (FileSystem.exists(eventsPath)) FileSystem.deleteFile(eventsPath);
 		}
 		#end
 
@@ -332,6 +337,7 @@ class Chart {
 	public static inline function filterMetaForSaving(meta:ChartMetaData):ChartMetaData {
 		var data:Dynamic = Reflect.copy(meta);
 		if (data.color != null) data.color = FlxColor.fromInt(data.color).toWebString(); // dont even ask me  - Nex
+		Reflect.deleteField(data, "name");
 		Reflect.deleteField(data, 'parsedColor');
 		Reflect.deleteField(data, 'metas');
 		Reflect.deleteField(data, "variant");

source/funkin/editors/charter/CharterSelection.hx

@@ -41,7 +41,7 @@ class CharterSelectionScreen extends EditorTreeMenuScreen {
 
 		for (d in s.difficulties) if (d != '') screen.add(makeChartOption(d, isVariant ? s.variant : null, s.name));
 		screen.add(new Separator());
-		for (v in s.variants) if (s.metas.get(v) != null) screen.add(makeVariationOption(s.metas.get(v)));
+		if (s.variants != null) for (v in s.variants) if (s.metas.get(v) != null) screen.add(makeVariationOption(s.metas.get(v)));
 
 		#if sys
 		screen.insert(0, new NewOption(getID('newDifficulty'), getID('newDifficultyDesc'), () -> {
@@ -113,6 +113,7 @@ class CharterSelectionScreen extends EditorTreeMenuScreen {
 
 		// Add to List
 		if (variant != null && curSong != null) {
+			if (curSong.variants == null) curSong.variants.push(variant);
 			curSong.variants.push(variant);
 			curSong.metas.set(variant, creation.meta);
 

source/funkin/editors/charter/SongCreationScreen.hx

@@ -357,7 +357,8 @@ class SongCreationScreen extends UISubstateWindow {
 	}
 
 	// for variations
-	function formatMeta(meta:ChartMetaData):ChartMetaData return meta;
+	function formatMeta(meta:ChartMetaData):ChartMetaData
+		return funkin.backend.chart.Chart.defaultChartMetaFields(meta);
 
 	function getChartSavePath(meta:ChartMetaData, diff:String):String
 		return 'charts/${meta.variant != null && meta.variant != "" ? meta.variant + "/" : ""}$diff.json';
@@ -432,7 +433,7 @@ class SongCreationScreen extends UISubstateWindow {
 				color: colorWheel.curColor,
 				opponentModeAllowed: opponentModeCheckbox.checked,
 				coopAllowed: coopAllowedCheckbox.checked,
-				difficulties: [for (diff in difficultiesTextBox.label.text.split(",")) diff.trim()],
+				difficulties: [for (diff in difficultiesTextBox.label.text.split(",")) diff.trim()]
 			});
 
 			if (onSave != null) onSave({

source/funkin/editors/charter/VariationCreationScreen.hx

@@ -39,6 +39,6 @@ class VariationCreationScreen extends SongCreationScreen {
 		meta.variant = meta.name;
 		meta.vocalsSuffix = meta.instSuffix = '-${meta.variant}';
 		meta.name = parentMeta.name;
-		return meta;
+		return super.formatMeta(meta);
 	}
 }

source/funkin/menus/FreeplayState.hx

@@ -505,10 +505,12 @@ class FreeplayState extends MusicBeatState
 		curDifficulties = songs[curSelected].difficulties.copy();
 		for (i in 0...curDifficulties.length) curDiffMetaKeys.push(null);
 		
-		var meta:ChartMetaData;
-		for (variant in songs[curSelected].variants) if ((meta = songs[curSelected].metas.get(variant)) != null) {
-			curDifficulties = curDifficulties.concat(meta.difficulties);
-			for (i in 0...meta.difficulties.length) curDiffMetaKeys.push(variant);
+		if (songs[curSelected].variants != null) {
+			var meta:ChartMetaData;
+			for (variant in songs[curSelected].variants) if ((meta = songs[curSelected].metas.get(variant)) != null) {
+				curDifficulties = curDifficulties.concat(meta.difficulties);
+				for (i in 0...meta.difficulties.length) curDiffMetaKeys.push(variant);
+			}
 		}
 	}