diff --git a/src/models/sortfilterroomtreemodel.cpp b/src/models/sortfilterroomtreemodel.cpp
index 0d371d766..9a28a8319 100644
--- a/src/models/sortfilterroomtreemodel.cpp
+++ b/src/models/sortfilterroomtreemodel.cpp
@@ -127,6 +127,7 @@ bool SortFilterRoomTreeModel::filterAcceptsRow(int source_row, const QModelIndex
     const QModelIndex index = sourceModel()->index(source_row, 0, source_parent);
     if (!index.isValid()) {
         qWarning() << source_row << source_parent << sourceModel()->rowCount(source_parent);
+        Q_ASSERT(false);
         return true;
     }