diff --git a/ChangeLog b/ChangeLog
index 31d7bb3ef9..4a3febde58 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Oct 27 05:56:39 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* vm.c (invoke_block_from_c): return Qnil when its iseq is
+	  SPECIAL CONST. [ruby-core:26335]
+
 Tue Oct 27 05:11:49 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* vm_exec.c (DECL_SC_REG): check defined(__asm__) before use it.
diff --git a/vm.c b/vm.c
index 066fe6f0fe..91a5c6d5ab 100644
--- a/vm.c
+++ b/vm.c
@@ -523,7 +523,9 @@ invoke_block_from_c(rb_thread_t *th, const rb_block_t *block,
 		    VALUE self, int argc, const VALUE *argv,
 		    const rb_block_t *blockptr, const NODE *cref)
 {
-    if (BUILTIN_TYPE(block->iseq) != T_NODE) {
+    if (SPECIAL_CONST_P(block->iseq))
+	return Qnil;
+    else if (BUILTIN_TYPE(block->iseq) != T_NODE) {
 	const rb_iseq_t *iseq = block->iseq;
 	const rb_control_frame_t *cfp;
 	int i, opt_pc, arg_size = iseq->arg_size;