diff --git a/src/vm.c b/src/vm.c
index 7edbdf3cb..bad4810ed 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -2065,6 +2065,9 @@ RETRY_TRY_BLOCK:
             }
             ci--;
           }
+          if (ci == mrb->c->cibase) {
+            goto L_BREAK_ERROR;
+          }
           break;
         default:
           /* cannot happen */