1 files changed, 2 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index 67c355678a..56e907ad2e 100644
--- a/gc.c
+++ b/gc.c
@@ -2327,6 +2327,7 @@ rb_imemo_new_debug(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0,
 VALUE
 rb_data_object_wrap(VALUE klass, void *datap, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree)
 {
+    RUBY_ASSERT_ALWAYS(dfree != (RUBY_DATA_FUNC)1);
     if (klass) Check_Type(klass, T_CLASS);
     return newobj_of(klass, T_DATA, (VALUE)dmark, (VALUE)dfree, (VALUE)datap, FALSE);
 }
@@ -2342,6 +2343,7 @@ rb_data_object_zalloc(VALUE klass, size_t size, RUBY_DATA_FUNC dmark, RUBY_DATA_
 VALUE
 rb_data_typed_object_wrap(VALUE klass, void *datap, const rb_data_type_t *type)
 {
+    RUBY_ASSERT_ALWAYS(type);
     if (klass) Check_Type(klass, T_CLASS);
     return newobj_of(klass, T_DATA, (VALUE)type, (VALUE)1, (VALUE)datap, type->flags & RUBY_FL_WB_PROTECTED);
 }