diff --git a/hscript/Interp.hx b/hscript/Interp.hx
index e7931c8..d6ef0cb 100644
--- a/hscript/Interp.hx
+++ b/hscript/Interp.hx
@@ -264,6 +264,7 @@ class Interp {
 
 		return switch(Tools.expr(e2))
 		{
+			// TODO: type check for custom classes
 			case EIdent("Class"):
 				Std.isOfType(expr1, Class);
 			case EIdent("Map") | EIdent("IMap"):
@@ -280,7 +281,10 @@ class Interp {
 
 	public function setVar(name:String, v:Dynamic):Void {
 		if (_inCustomClass && _proxy.superClass != null) {
-			if (_proxy.superHasField(name)) {
+			if (_proxy.superIsCustomClass) {
+				cast(_proxy.superClass, CustomClass).hset(name, v);
+			}
+			else if (_proxy.superHasField(name)) {
 				Reflect.setProperty(_proxy.superClass, name, v);
 			}
 		}
@@ -1790,8 +1794,12 @@ class Interp {
 		// Custom logic to handle super calls to prevent infinite recursion
 		if(_inCustomClass) {
 			// Force call super function.
-			if(o == _proxy.superClass)
-				return call(o, Reflect.field(_proxy.superClass, '_HX_SUPER__${f}'), args);
+			if(o == _proxy.superClass) {
+				if(_proxy.superIsCustomClass)
+					cast(_proxy.superClass, CustomClass).callFunction(f, args);
+				else
+					return call(o, Reflect.field(_proxy.superClass, '_HX_SUPER__${f}'), args);
+			}	
 		}
 		else if (o is CustomClass) {
 			_nextCallObject = null;
diff --git a/hscript/customclass/CustomClass.hx b/hscript/customclass/CustomClass.hx
index 30efd16..df8660c 100644
--- a/hscript/customclass/CustomClass.hx
+++ b/hscript/customclass/CustomClass.hx
@@ -27,6 +27,10 @@ class CustomClass implements IHScriptCustomAccessBehaviour {
 	public var superClass:Dynamic;
 	public var superConstructor(default, null):Dynamic;
 
+	public var superIsCustomClass(get, never):Bool;
+	private function get_superIsCustomClass():Bool
+		return (superClass != null && superClass is CustomClass);
+
 	public var className(get, never):String;
 	private function get_className():String {
 		return __class.toString();
@@ -41,8 +45,8 @@ class CustomClass implements IHScriptCustomAccessBehaviour {
 
 	public var __allowSetGet:Bool = false;
 
-	private var isInline:Bool = false;
-	private var ogVariables:Map<String, Dynamic>;
+	private var isInline(default, null):Bool = false;
+	private var ogVariables(default, null):Map<String, Dynamic>;
 
 	public function new(__class:CustomClassDecl, args:Array<Dynamic>, ?extendFieldDecl:Map<String, Dynamic>, ?ogInterp:Interp, ?callNew:Bool = true) {
 		this.__class = __class;
@@ -235,7 +239,7 @@ class CustomClass implements IHScriptCustomAccessBehaviour {
 	// Field check
 
 	private function hasField(name:String):Bool {
-		return __cachedFieldDecls != null ? __cachedFieldDecls.exists(name) : false;
+		return __cachedFieldDecls.exists(name);
 	}
 
 	private function getField(name:String):FieldDecl {
@@ -243,15 +247,15 @@ class CustomClass implements IHScriptCustomAccessBehaviour {
 	}
 
 	private function hasVar(name:String):Bool {
-		return __cachedVarDecls != null ? __cachedVarDecls.exists(name) : false;
+		return __cachedVarDecls.exists(name);
 	}
 
 	private function getVar(name:String):VarDecl {
-		return __cachedVarDecls != null ? __cachedVarDecls.get(name) : null;
+		return __cachedVarDecls.get(name);
 	}
 
 	private function hasFunction(name:String):Bool {
-		return __cachedFunctionDecls != null ? __cachedFunctionDecls.exists(name) : false;
+		return __cachedFunctionDecls.exists(name);
 	}
 
 	private function getFunction(name:String):Function {
@@ -277,6 +281,8 @@ class CustomClass implements IHScriptCustomAccessBehaviour {
 		if (__superClassFieldList == null) {
 			var realFields = Reflect.fields(superClass).concat(Type.getInstanceFields(Type.getClass(superClass)));
 			__superClassFieldList = realFields;
+
+			// TODO: macro-based superclass iteration for Custom Class as superclass
 		}
 
 		return __superClassFieldList.indexOf(name) != -1;