From 9b96f8737724c481066d2e1bc2280c1de42ef136 Mon Sep 17 00:00:00 2001
From: karroffel <therzog@mail.de>
Date: Thu, 18 Jan 2018 12:04:34 +0100
Subject: [PATCH] [GDNative] fix #15723

---
 .../gdnative/nativescript/nativescript.cpp    | 41 +++++++++++++++++--
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/modules/gdnative/nativescript/nativescript.cpp b/modules/gdnative/nativescript/nativescript.cpp
index cff5d9c9bdc..2216be02576 100644
--- a/modules/gdnative/nativescript/nativescript.cpp
+++ b/modules/gdnative/nativescript/nativescript.cpp
@@ -798,11 +798,33 @@ NativeScriptLanguage *NativeScriptLanguage::singleton;
 void NativeScriptLanguage::_unload_stuff(bool p_reload) {
 	for (Map<String, Map<StringName, NativeScriptDesc> >::Element *L = library_classes.front(); L; L = L->next()) {
 
-		if (p_reload && library_gdnatives[L->key()].is_valid() && !library_gdnatives[L->key()]->get_library()->is_reloadable()) {
-			continue;
+		String lib_path = L->key();
+		Map<StringName, NativeScriptDesc> classes = L->get();
+
+		if (p_reload) {
+
+			Map<String, Ref<GDNative> >::Element *E = library_gdnatives.find(lib_path);
+			Ref<GDNative> gdn;
+
+			if (E) {
+				gdn = E->get();
+			}
+
+			bool should_reload = false;
+
+			if (gdn.is_valid()) {
+				Ref<GDNativeLibrary> lib = gdn->get_library();
+				if (lib.is_valid()) {
+					should_reload = lib->is_reloadable();
+				}
+			}
+
+			if (!should_reload) {
+				continue;
+			}
 		}
 
-		for (Map<StringName, NativeScriptDesc>::Element *C = L->get().front(); C; C = C->next()) {
+		for (Map<StringName, NativeScriptDesc>::Element *C = classes.front(); C; C = C->next()) {
 
 			// free property stuff first
 			for (OrderedHashMap<StringName, NativeScriptDesc::Property>::Element P = C->get().properties.front(); P; P = P.next()) {
@@ -1063,6 +1085,11 @@ void NativeScriptLanguage::unregister_script(NativeScript *script) {
 void NativeScriptLanguage::call_libraries_cb(const StringName &name) {
 	// library_gdnatives is modified only from the main thread, so it's safe not to use mutex here
 	for (Map<String, Ref<GDNative> >::Element *L = library_gdnatives.front(); L; L = L->next()) {
+
+		if (L->get().is_null()) {
+			continue;
+		}
+
 		if (L->get()->is_initialized()) {
 
 			void *proc_ptr;
@@ -1125,6 +1152,10 @@ void NativeReloadNode::_notification(int p_what) {
 
 				Ref<GDNative> gdn = L->get();
 
+				if (gdn.is_null()) {
+					continue;
+				}
+
 				if (!gdn->get_library()->is_reloadable()) {
 					continue;
 				}
@@ -1149,6 +1180,10 @@ void NativeReloadNode::_notification(int p_what) {
 
 				Ref<GDNative> gdn = L->get();
 
+				if (gdn.is_null()) {
+					continue;
+				}
+
 				if (!gdn->get_library()->is_reloadable()) {
 					continue;
 				}