OP_BLKPUSH is invalid outside of methods; fix #3501

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vm.c b/src/vm.c
index 59c8624e2..946d68323 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1892,7 +1892,7 @@ RETRY_TRY_BLOCK:
       if (lv == 0) stack = regs + 1;
       else {
         struct REnv *e = uvenv(mrb, lv-1);
-        if (!e) {
+        if (!e || e->mid == 0) {
           localjump_error(mrb, LOCALJUMP_ERROR_YIELD);
           goto L_RAISE;
         }