From 871a73341b0eedf1ee9164988c5bb9dd0b57a659 Mon Sep 17 00:00:00 2001
From: Haoyu Qiu <timothyqiu32@gmail.com>
Date: Sun, 13 Mar 2022 23:17:25 +0800
Subject: [PATCH] Fix crash when is-operator right-hand-side is null

---
 modules/gdscript/gdscript_function.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/modules/gdscript/gdscript_function.cpp b/modules/gdscript/gdscript_function.cpp
index 850d75aa8eb..40a2466ed92 100644
--- a/modules/gdscript/gdscript_function.cpp
+++ b/modules/gdscript/gdscript_function.cpp
@@ -509,7 +509,11 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 
 #ifdef DEBUG_ENABLED
 						if (!nc) {
-							err_text = "Right operand of 'is' is not a class (type: '" + obj_B->get_class() + "').";
+							if (obj_B) {
+								err_text = "Right operand of 'is' is not a class (type: '" + obj_B->get_class() + "').";
+							} else {
+								err_text = "Right operand of 'is' is null.";
+							}
 							OPCODE_BREAK;
 						}
 #endif