From a13fd5f7cc4005297d87d0a53a15bc62e14f4fd4 Mon Sep 17 00:00:00 2001
From: Roni Kirla <roni.kirla@gmail.com>
Date: Sun, 7 May 2023 00:13:33 +0300
Subject: [PATCH] Fix read access violation

---
 src/common/address_space.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/common/address_space.inc b/src/common/address_space.inc
index 2195dabd5..c97dc8651 100644
--- a/src/common/address_space.inc
+++ b/src/common/address_space.inc
@@ -72,7 +72,7 @@ MAP_MEMBER(void)::MapLocked(VaType virt, PaType phys, VaType size, ExtraBlockInf
                 }
             }()};
 
-            if (block_end_predecessor->virt >= virt) {
+            if (block_end_predecessor != blocks.begin() && block_end_predecessor->virt >= virt) {
                 // If this block's start would be overlapped by the map then reuse it as a tail
                 // block
                 block_end_predecessor->virt = virt_end;