From 7f1917f166f6bc1eca879bf1b767fe5589b22c55 Mon Sep 17 00:00:00 2001
From: Nikolai Romashchenko <nikolay.romashchenko@gmail.com>
Date: Wed, 17 Apr 2024 12:57:18 +0200
Subject: [PATCH] Fixed a crash during the second merge phase where a batch was
 empty

---
 i2l                    | 2 +-
 ipk/src/db_builder.cpp | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/i2l b/i2l
index a6ef750..bb52a84 160000
--- a/i2l
+++ b/i2l
@@ -1 +1 @@
-Subproject commit a6ef750d334c7b08ad82a4ea5fecd6849c8a72ca
+Subproject commit bb52a84f5c9cb4b52629682fead61b3c5d7bdc64
diff --git a/ipk/src/db_builder.cpp b/ipk/src/db_builder.cpp
index 92a9109..9d4244a 100644
--- a/ipk/src/db_builder.cpp
+++ b/ipk/src/db_builder.cpp
@@ -326,7 +326,10 @@ namespace ipk
         std::priority_queue<kmer_fv, std::vector<kmer_fv>, std::greater<>> heap;
         for (const auto& batch_db : batch_dbs)
         {
-            heap.push(batch_db.kmer_order[0]);
+            if (!batch_db.kmer_order.empty())
+            {
+                heap.push(batch_db.kmer_order[0]);
+            }
         }
 
         ProgressBar bar2{
@@ -438,7 +441,7 @@ namespace ipk
         for (size_t batch_id = 0; batch_id < _num_batches; ++batch_id)
         {
             batches.emplace_back(get_batch_db_name(batch_id));
-            auto& loader = batches[batch_id];
+            auto& loader= batches[batch_id];
 
             /// pre-load the first k-mer and push the loader to the queue
             if (loader.has_next())