1 files changed, 2 insertions, 0 deletions
diff --git a/seqWindow.cpp b/seqWindow.cpp
index 20973b5..cf4cf1c 100644
--- a/seqWindow.cpp
+++ b/seqWindow.cpp
@@ -71,6 +71,8 @@ bool SeqWindow::hasSeqNr(sender_id_t sender, seq_nr_t seq)
 void SeqWindow::addSeqNr(sender_id_t sender, seq_nr_t seq)
 {
   Lock lock(mutex_);
+  if (!window_size_)
+    return;
   if(sender_[sender].size() >= window_size_)
     sender_[sender].pop_front();
   sender_[sender].push_back(seq);