diff --git a/src/libs/antares/study/parts/common/cluster_list.cpp b/src/libs/antares/study/parts/common/cluster_list.cpp
index 1458cd9750..0ba7cf2afb 100644
--- a/src/libs/antares/study/parts/common/cluster_list.cpp
+++ b/src/libs/antares/study/parts/common/cluster_list.cpp
@@ -177,6 +177,7 @@ void ClusterList<ClusterT>::storeTimeseriesNumbers(Solver::IResultWriter::Ptr wr
     each([&](const Cluster& cluster) {
         path.clear() << "ts-numbers" << SEP << typeID() << SEP << cluster.parentArea->id << SEP
                      << cluster.id() << ".txt";
+        ts_content.clear(); // We must clear ts_content here, since saveToBuffer does not do it.
         cluster.series->timeseriesNumbers.saveToBuffer(ts_content, 0, true, predicate, true);
         writer->addEntryFromBuffer(path.c_str(), ts_content);
     });