Errors after deleting page elements in Mendix Studio Pro.

I get the following error when trying to delete input fields inside Studio Pro 10.18.1. Structure mode and design mode become unresponsive afterwards, not allowing me to change anything and not being able to save my changes. The only way to continue my work is to restart Mendix. System.InvalidOperationException: Sequence contains no elements at System.Linq.ThrowHelper.ThrowNoElementsException() at System.Linq.Enumerable.Aggregate[TSource](IEnumerable`1 source, Func`3 func) at Mendix.Modeler.WebUI.View.Windows.StructureMode.StructureModeEditor.CenterOnSelection() in Mendix.Modeler.WebUI.View.Windows\StructureMode\StructureModeEditor.cs:line 292 at Mendix.Modeler.WebUI.View.Editors.FormEditor.OpenStructureMode(Boolean isInitialLoad) in Mendix.Modeler.WebUI.View\Editors\FormEditor.cs:line 274 at Mendix.Modeler.WebUI.View.Editors.FormEditor.Mendix.Modeler.WebUI.View.Editors.IFormEditor.OpenStructureMode() in Mendix.Modeler.WebUI.View\Editors\FormEditor.cs:line 247 at Mendix.Modeler.WebUI.View.Editors.DesignMode.WebFormEditor.OnBrowserMessage(Object sender, WebBrowserMessageEventArgs args) in Mendix.Modeler.WebUI.View\Editors\DesignMode\WebFormEditor.cs:line 445 at Mendix.Modeler.Controls.WebBrowser.WebBrowser.OnMessage(WebBrowserMessageEventArgs args) in Mendix.Modeler.Controls\WebBrowser\WebBrowser.cs:line 74 at Mendix.Modeler.WebEditors.WebEditorControl.OnMessage(WebBrowserMessageEventArgs args) in Mendix.Modeler.WebEditors\Control\WebEditorControl.cs:line 103 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)