From e67e2040be693122b54fc83797cdc9eb07221aea Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Mon, 28 Sep 2020 18:17:58 +0200
Subject: [PATCH] ARM64: Followup fix for exit branch patching.

---
 src/lj_asm_arm64.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lj_asm_arm64.h b/src/lj_asm_arm64.h
index 37b79cde..e80e1b41 100644
--- a/src/lj_asm_arm64.h
+++ b/src/lj_asm_arm64.h
@@ -2021,7 +2021,7 @@ void lj_asm_patchexit(jit_State *J, GCtrace *T, ExitNo exitno, MCode *target)
     *px = A64I_B | A64F_S26(delta);
     if (!cstart) cstart = px;
   }
-  lj_mcode_sync(cstart, px+1);
+  if (cstart) lj_mcode_sync(cstart, px+1);
   lj_mcode_patch(J, mcarea, 1);
 }