Never call kind_of with klass=0

1 files changed, 2 insertions, 0 deletions

diff --git a/object.c b/object.c
index f056767f13..ff94469292 100644
--- a/object.c
+++ b/object.c
@@ -791,6 +791,8 @@ rb_obj_is_kind_of(VALUE obj, VALUE c)
 {
     VALUE cl = CLASS_OF(obj);
 
+    RUBY_ASSERT(cl);
+
     // Note: YJIT needs this function to never allocate and never raise when
     // `c` is a class or a module.
     c = class_or_module_required(c);