Fix read access violation

1 files changed, 1 insertions, 1 deletions

diff --git a/src/common/address_space.inc b/src/common/address_space.inc
index 2195dabd54..c97dc86516 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;