1 files changed, 1 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index 93a816dd37..755c28f2da 100644
--- a/vm.c
+++ b/vm.c
@@ -839,7 +839,7 @@ invoke_block_from_c_0(rb_thread_t *th, const rb_block_t *block,
 		      VALUE self, int argc, const VALUE *argv, const rb_block_t *blockptr,
 		      const rb_cref_t *cref, const int splattable)
 {
-    if (UNLIKELY(SPECIAL_CONST_P(block->iseq))) {
+    if (UNLIKELY(!RTEST(block->iseq))) {
 	return Qnil;
     }
     else if (LIKELY(RUBY_VM_NORMAL_ISEQ_P(block->iseq))) {