Opening multiple databases with drag'n'drop, produces errors.

[Former user]

Opening multiple databases with drag'n'drop (10-15), produces the following (multiple) errors.

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Error

NullReferenceException: Object reference not set to an instance of an object.

Romcenter will now close.

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[Wanderer]

Error log:

‌

<log4j:event logger="Romcenter" level="FATAL" timestamp="1597839760658" thread="1">log4j:messageObject reference not set to an instance of an object.
at RomCenter.Logic.ViewModel.Datagrids.GamesViewModel.Update(BaseWpfDbItem newItem, Boolean forceUpdate)
at RomCenter.Logic.ViewModel.Datagrids.GamesViewModel.set_SelectedTreeItem(TreeItem value)
at RomCenter.Logic.ViewModel.DatasRwViewModel.StartDataGridUpdate(TreeItem treeItem)
at RomCenter.Logic.ViewModel.DatasViewModel.set_SelectedTreeItem(TreeItem value)
at RomCenterWpf.Views.DatasView.<.ctor>b__2_0(Object sender, EventArgs arg) in C:\Projects\Romcenter 4.0\RomCenterWpf\Views\DatasView.xaml.cs:line 37
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)</log4j:message>log4j:throwableSystem.NullReferenceException: Object reference not set to an instance of an object.
at RomCenter.Logic.ViewModel.Datagrids.GamesViewModel.Update(BaseWpfDbItem newItem, Boolean forceUpdate)
at RomCenter.Logic.ViewModel.Datagrids.GamesViewModel.set_SelectedTreeItem(TreeItem value)
at RomCenter.Logic.ViewModel.DatasRwViewModel.StartDataGridUpdate(TreeItem treeItem)
at RomCenter.Logic.ViewModel.DatasViewModel.set_SelectedTreeItem(TreeItem value)
at RomCenterWpf.Views.DatasView.<.ctor>b__2_0(Object sender, EventArgs arg) in C:\Projects\Romcenter 4.0\RomCenterWpf\Views\DatasView.xaml.cs:line 37
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)</log4j:throwable><log4j:NDC />log4j:throwable<![CDATA[System.NullReferenceException: Object reference not set to an instance of an object.
at RomCenter.Logic.ViewModel.Datagrids.GamesViewModel.Update(BaseWpfDbItem newItem, Boolean forceUpdate)
at RomCenter.Logic.ViewModel.Datagrids.GamesViewModel.set_SelectedTreeItem(TreeItem value)
at RomCenter.Logic.ViewModel.DatasRwViewModel.StartDataGridUpdate(TreeItem treeItem)
at RomCenter.Logic.ViewModel.DatasViewModel.set_SelectedTreeItem(TreeItem value)
at RomCenterWpf.Views.DatasView.<.ctor>b__2_0(Object sender, EventArgs arg) in C:\Projects\Romcenter 4.0\RomCenterWpf\Views\DatasView.xaml.cs:line 37
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)]]></log4j:throwable><log4j:locationInfo class="RomCenter.Global.BaseLog" method="Void Fatal(System.String, System.Exception)" file="C:\Projects\Romcenter 4.0\Global\RcLog.cs" line="218" />nlog:eventSequenceNumber682</nlog:eventSequenceNumber><nlog:locationInfo assembly="RomCenter.Global, Version=4.0.1.541, Culture=neutral, PublicKeyToken=null" /><nlog:properties />log4j:properties<log4j:data name="log4japp" value="true" /><log4j:data name="log4jmachinename" value="MYPC" /></log4j:properties></log4j:event>