diff --git a/.qmake.conf b/.qmake.conf
index 37b0569..5b955da 100644
--- a/.qmake.conf
+++ b/.qmake.conf
@@ -3,7 +3,7 @@ load(qt_build_config)
 CONFIG += warning_clean exceptions qt_module_build c++17
 DEFINES += QT_DEPRECATED_WARNINGS QT_ASCII_CAST_WARNINGS
 
-MODULE_VERSION = 0.6.0
+MODULE_VERSION = 0.6.1
 
 # had to be added because std::visit only works on macos 10.14 and above
 # remove again once Qt raises the value to 10.14!
diff --git a/src/nut/core/abstracttableset.cpp b/src/nut/core/abstracttableset.cpp
index cec5deb..e1b7eb9 100644
--- a/src/nut/core/abstracttableset.cpp
+++ b/src/nut/core/abstracttableset.cpp
@@ -49,34 +49,27 @@ AbstractTableSet::~AbstractTableSet()
             t->setParentTableSet(nullptr);
 }
 
-int AbstractTableSet::save(Database *db, bool cleanUp)
+int AbstractTableSet::save(Database *db)
 {
     int rowsAffected = 0;
     TableModel *masterModel = nullptr;
     if (data->table)
-        masterModel = db->model().tableByClassName(QString::fromUtf8(data->table->metaObject()->className()));
+        masterModel = db->model().tableByClassName(
+            QString::fromUtf8(data->table->metaObject()->className()));
 
-    for (auto &t : data->children) {
-        if (data->table)
-            t->setParentTable(data->table,
-                              masterModel,
-                              db->model().tableByClassName(
-                                  QString::fromUtf8(t->metaObject()->className())));
+    for (auto i = data->weakChildren.begin(); i != data->weakChildren.end(); ) {
+        auto &row = *i;
 
-        if (t->status() == Table::Added || t->status() == Table::Modified
-            || t->status() == Table::Deleted) {
-            rowsAffected += t->save(db);
-            if (cleanUp)
-#ifdef NUT_RAW_POINTER
-                t->deleteLater();
-#else
-                remove(t);
-#endif
+        if (!row) {
+            i = data->weakChildren.erase(i);
+            continue;
         }
-    }
-
-    for (auto &row : data->weakChildren) {
         auto t = row.lock();
+        if (t.isNull()) {
+            i = data->weakChildren.erase(i);
+            continue;
+        }
+
         if (data->table)
             t->setParentTable(data->table,
                               masterModel,
@@ -86,25 +79,38 @@ int AbstractTableSet::save(Database *db, bool cleanUp)
         if (t->status() == Table::Added || t->status() == Table::Modified
             || t->status() == Table::Deleted) {
             rowsAffected += t->save(db);
-            if (cleanUp)
-#ifdef NUT_RAW_POINTER
-                t->deleteLater();
-#else
-                remove(row);
-#endif
         }
+        i++;
     }
 
-    if (cleanUp) {
-        data->children.clear();
-        data->weakChildren.clear();
+    for (auto i = data->children.begin(); i != data->children.end(); ) {
+        auto &t = *i;
+        if (!t) {
+            i = data->children.erase(i);
+            continue;
+        }
+
+        if (data->table)
+            t->setParentTable(data->table,
+                              masterModel,
+                              db->model().tableByClassName(
+                                  QString::fromUtf8(t->metaObject()->className())));
+
+        if (t->status() == Table::Added || t->status() == Table::Modified
+            || t->status() == Table::Deleted) {
+            rowsAffected += t->save(db);
+            data->weakChildren.append(t.toWeakRef());
+        }
+        i++;
     }
 
+    data->children.clear();
+
     return rowsAffected;
 }
 
-void AbstractTableSet::clearChildren()
-{
+    void AbstractTableSet::clearChildren()
+    {
 #ifdef NUT_RAW_POINTER
     for (auto &t: data->children)
         t->deleteLater();
@@ -130,6 +136,11 @@ void AbstractTableSet::remove(Row<Table> t)
 {
     data.detach();
     data->children.removeAll(t);
+
+#ifdef NUT_RAW_POINTER
+    t->deleteLater();
+#endif
+
 }
 
 void AbstractTableSet::remove(WeakRow<Table> t)
diff --git a/src/nut/core/abstracttableset.h b/src/nut/core/abstracttableset.h
index 35d6c6c..36e4b2b 100644
--- a/src/nut/core/abstracttableset.h
+++ b/src/nut/core/abstracttableset.h
@@ -44,7 +44,7 @@ public:
     explicit AbstractTableSet(Table *parent);
     virtual ~AbstractTableSet();
 
-    virtual int save(Database *db, bool cleanUp = false);
+    virtual int save(Database *db);
     void clearChildren();
     QString childClassName() const;
 
diff --git a/src/nut/core/database.cpp b/src/nut/core/database.cpp
index da53f73..7c6c091 100644
--- a/src/nut/core/database.cpp
+++ b/src/nut/core/database.cpp
@@ -134,7 +134,7 @@ bool DatabasePrivate::updateDatabase()
 {
     Q_Q(Database);
 
-    QString databaseHistoryName = driver + "\t" + databaseName + "\t" + hostName;
+    QString databaseHistoryName = driver + QStringLiteral("\t") + databaseName + QStringLiteral("\t") + hostName;
 
     if (updatedDatabases.contains(databaseHistoryName))
         return true;
@@ -331,7 +331,7 @@ bool DatabasePrivate::putModelToDatabase()
     changeLog->setData(QString::fromUtf8(QJsonDocument(current.toJson()).toJson(QJsonDocument::Compact)));
     changeLog->setVersion(current.version());
     changeLogs->append(changeLog);
-    q->saveChanges(true);
+    q->saveChanges();
     changeLog->deleteLater();
 
     return true;
@@ -597,7 +597,7 @@ void Database::add(AbstractTableSet *t)
     d->tableSets.insert(t);
 }
 
-int Database::saveChanges(bool cleanUp)
+int Database::saveChanges()
 {
     Q_D(Database);
 
@@ -608,7 +608,7 @@ int Database::saveChanges(bool cleanUp)
 
     int rowsAffected = 0;
     for (const auto &ts: qAsConst(d->tableSets))
-        rowsAffected += ts->save(this, cleanUp);
+        rowsAffected += ts->save(this);
 
     return rowsAffected;
 }
diff --git a/src/nut/core/database.h b/src/nut/core/database.h
index 6df88c6..42bc017 100644
--- a/src/nut/core/database.h
+++ b/src/nut/core/database.h
@@ -59,7 +59,7 @@ public:
 
     QSqlQuery exec(const QString& sql);
 
-    int saveChanges(bool cleanUp = true);
+    int saveChanges();
     void cleanUp();
 
     QString databaseName() const;
diff --git a/src/nut/core/table.cpp b/src/nut/core/table.cpp
index 61ac8b1..b2566d1 100644
--- a/src/nut/core/table.cpp
+++ b/src/nut/core/table.cpp
@@ -179,7 +179,6 @@ AbstractTableSet *Table::childTableSet(const QString &name) const
 int Table::save(Database *db)
 {
     //Q_D(Table);
-
     QSqlQuery q = db->exec(db->sqlGenerator()->saveRecord(this, db->tableName(QString::fromUtf8(metaObject()->className()))));
 
     auto model = db->model().tableByClassName(QString::fromUtf8(metaObject()->className()));