From fbefb19e10e2b0b52b4ba1759bf8093883ba4ade Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 15 Mar 2020 15:07:49 +0100
Subject: [PATCH] LibJS: Interpreter should make sure that the "this" stack
 gets marked

---
 Libraries/LibJS/Interpreter.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Libraries/LibJS/Interpreter.cpp b/Libraries/LibJS/Interpreter.cpp
index dfbaa35ebb..f08839d5d2 100644
--- a/Libraries/LibJS/Interpreter.cpp
+++ b/Libraries/LibJS/Interpreter.cpp
@@ -144,6 +144,11 @@ void Interpreter::collect_roots(Badge<Heap>, HashTable<Cell*>& roots)
                 roots.set(it.value.value.as_cell());
         }
     }
+
+    for (auto& this_value : m_this_stack) {
+        if (this_value.is_cell())
+            roots.set(this_value.as_cell());
+    }
 }
 
 }