vm: execute ensure without exception at the top of the fiber; fix #2904

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vm.c b/src/vm.c
index 765512a34..025b487bc 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1032,7 +1032,7 @@ RETRY_TRY_BLOCK:
       mrb_callinfo *ci = mrb->c->ci;
       int n, eidx = ci->eidx;
 
-      for (n=0; n<a && eidx > ci[-1].eidx; n++) {
+      for (n=0; n<a && (ci == mrb->c->cibase || eidx > ci[-1].eidx); n++) {
         ecall(mrb, --eidx);
         ARENA_RESTORE(mrb, ai);
       }