From 3b602dec214f5281ae00f40dd48f084e33324d4d Mon Sep 17 00:00:00 2001
From: Marcus Holland-Moritz <github@mhxnet.de>
Date: Fri, 5 Mar 2021 12:44:01 +0100
Subject: [PATCH] Fix pop from empty queue

---
 src/dwarfs/block_manager.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dwarfs/block_manager.cpp b/src/dwarfs/block_manager.cpp
index 5d7223e0..652fd96f 100644
--- a/src/dwarfs/block_manager.cpp
+++ b/src/dwarfs/block_manager.cpp
@@ -372,7 +372,7 @@ template <typename LoggerPolicy>
 void block_manager_<LoggerPolicy>::append_to_block(inode& ino, mmif& mm,
                                                    size_t offset, size_t size) {
   if (DWARFS_UNLIKELY(blocks_.empty() or blocks_.back().full())) {
-    if (blocks_.size() >= cfg_.max_active_blocks) {
+    if (blocks_.size() >= std::max<size_t>(1, cfg_.max_active_blocks)) {
       blocks_.pop_front();
     }