From 8a42ab7a850a5d8f2e3ecc9768f59d8444cec609 Mon Sep 17 00:00:00 2001
From: Haoyu Qiu <timothyqiu32@gmail.com>
Date: Fri, 14 Jan 2022 23:34:59 +0800
Subject: [PATCH] Fix crash when `is` keyword is tested against a String
 variable

---
 modules/gdscript/gdscript_function.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/gdscript/gdscript_function.cpp b/modules/gdscript/gdscript_function.cpp
index 5189fd294db..850d75aa8eb 100644
--- a/modules/gdscript/gdscript_function.cpp
+++ b/modules/gdscript/gdscript_function.cpp
@@ -473,7 +473,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 					err_text = "Left operand of 'is' was already freed.";
 					OPCODE_BREAK;
 				}
-				if (b->is_invalid_object()) {
+				if (b->get_type() != Variant::OBJECT || b->is_invalid_object()) {
 					err_text = "Right operand of 'is' is not a class.";
 					OPCODE_BREAK;
 				}