diff --git a/src/plugins/studiowelcome/stylemodel.cpp b/src/plugins/studiowelcome/stylemodel.cpp
index d93fc5fded2..79669ff2a5f 100644
--- a/src/plugins/studiowelcome/stylemodel.cpp
+++ b/src/plugins/studiowelcome/stylemodel.cpp
@@ -63,6 +63,8 @@ int StyleModel::filteredIndex(int actualIndex)
     if (actualIndex < 0)
         return actualIndex;
 
+    QTC_ASSERT(actualIndex < m_items.size(), return -1);
+
     QStandardItem *item = m_items.at(actualIndex);
     // TODO: perhaps should add this kind of find to utils/algorithm.h
     auto it = std::find(std::cbegin(m_filteredItems), std::cend(m_filteredItems), item);