From 565bb3afcc207aea6608bb119e21c6833f1b87b3 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Tue, 28 Jun 2016 10:44:38 -0300
Subject: [PATCH] Fix extends issue, closes #4026

---
 modules/gdscript/gd_compiler.cpp | 4 +++-
 modules/gdscript/gd_script.cpp   | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/modules/gdscript/gd_compiler.cpp b/modules/gdscript/gd_compiler.cpp
index 7481eac6200..d9bbe42979d 100644
--- a/modules/gdscript/gd_compiler.cpp
+++ b/modules/gdscript/gd_compiler.cpp
@@ -1497,7 +1497,8 @@ Error GDCompiler::_parse_class(GDScript *p_script, GDScript *p_owner, const GDPa
 					String sub = p_class->extends_class[i];
 					if (script->subclasses.has(sub)) {
 
-						script=script->subclasses[sub];
+						Ref<Script> subclass = script->subclasses[sub]; //avoid reference from dissapearing
+						script=subclass;
 					} else {
 
 						_set_error("Could not find subclass: "+sub,p_class);
@@ -1683,6 +1684,7 @@ Error GDCompiler::_parse_class(GDScript *p_script, GDScript *p_owner, const GDPa
 		if (err)
 			return err;
 
+
 		p_script->constants.insert(name,subclass); //once parsed, goes to the list of constants
 		p_script->subclasses.insert(name,subclass);
 
diff --git a/modules/gdscript/gd_script.cpp b/modules/gdscript/gd_script.cpp
index e37a2ca1551..99f349def5d 100644
--- a/modules/gdscript/gd_script.cpp
+++ b/modules/gdscript/gd_script.cpp
@@ -874,6 +874,10 @@ GDScript::~GDScript() {
 		memdelete( E->get() );
 	}
 
+	for (Map<StringName,Ref<GDScript> >::Element *E=subclasses.front();E;E=E->next()) {
+		E->get()->_owner=NULL; //bye, you are no longer owned cause I died
+	}
+
 #ifdef DEBUG_ENABLED
 	if (GDScriptLanguage::get_singleton()->lock) {
 		GDScriptLanguage::get_singleton()->lock->lock();