1 files changed, 28 insertions, 2 deletions

diff --git a/core/config/engine.cpp b/core/config/engine.cpp
index 17d3bdb744..0e27d556ec 100644
--- a/core/config/engine.cpp
+++ b/core/config/engine.cpp
@@ -260,14 +260,21 @@ bool Engine::is_printing_error_messages() const {
 }
 
 void Engine::add_singleton(const Singleton &p_singleton) {
-	ERR_FAIL_COND_MSG(singleton_ptrs.has(p_singleton.name), "Can't register singleton that already exists: " + String(p_singleton.name));
+	ERR_FAIL_COND_MSG(singleton_ptrs.has(p_singleton.name), vformat("Can't register singleton '%s' because it already exists.", p_singleton.name));
 	singletons.push_back(p_singleton);
 	singleton_ptrs[p_singleton.name] = p_singleton.ptr;
 }
 
 Object *Engine::get_singleton_object(const StringName &p_name) const {
 	HashMap<StringName, Object *>::ConstIterator E = singleton_ptrs.find(p_name);
-	ERR_FAIL_COND_V_MSG(!E, nullptr, "Failed to retrieve non-existent singleton '" + String(p_name) + "'.");
+	ERR_FAIL_COND_V_MSG(!E, nullptr, vformat("Failed to retrieve non-existent singleton '%s'.", p_name));
+
+#ifdef TOOLS_ENABLED
+	if (!is_editor_hint() && is_singleton_editor_only(p_name)) {
+		ERR_FAIL_V_MSG(nullptr, vformat("Can't retrieve singleton '%s' outside of editor.", p_name));
+	}
+#endif
+
 	return E->value;
 }
 
@@ -282,6 +289,19 @@ bool Engine::is_singleton_user_created(const StringName &p_name) const {
 
 	return false;
 }
+
+bool Engine::is_singleton_editor_only(const StringName &p_name) const {
+	ERR_FAIL_COND_V(!singleton_ptrs.has(p_name), false);
+
+	for (const Singleton &E : singletons) {
+		if (E.name == p_name && E.editor_only) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
 void Engine::remove_singleton(const StringName &p_name) {
 	ERR_FAIL_COND(!singleton_ptrs.has(p_name));
 
@@ -300,6 +320,12 @@ bool Engine::has_singleton(const StringName &p_name) const {
 
 void Engine::get_singletons(List<Singleton> *p_singletons) {
 	for (const Singleton &E : singletons) {
+#ifdef TOOLS_ENABLED
+		if (!is_editor_hint() && E.editor_only) {
+			continue;
+		}
+#endif
+
 		p_singletons->push_back(E);
 	}
 }