diff --git a/src/usersmodel.cpp b/src/usersmodel.cpp
--- a/src/usersmodel.cpp
+++ b/src/usersmodel.cpp
@@ -38,7 +38,11 @@
 
 QVariant UsersModel::data(const QModelIndex &index, int role) const
 {
-    const KUser user = mUserList[index.row()];
+    auto row = index.row();
+    if (row < 0 || row >= mUserList.count()) {
+        return QVariant();
+    }
+    const KUser &user = mUserList[row];
 
     switch(role) {
         case Qt::DisplayRole: