Crash while opening project (#1582)

I get the following crash when I try to open my project with v11.92:

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

at SoftwareIdeas.Common.Utils.XmlUtils.GetFloatList(String data, Single defaultValue)

at SoftwareIdeasModeler.Core.DiagramItems.UserInterface.ConcreteGrid.LoadLayout(XElement elem)

at SoftwareIdeasModeler.Core.Projecting.ConcreteDiagramElement.Load(SimXmlReader reader, Diagram diagram, XElement elem)

at SoftwareIdeasModeler.Core.Projecting.DiagramLayer.Load(SimXmlReader reader, Diagram diagram, XElement xElem)

at SoftwareIdeasModeler.Core.Projecting.Diagram.LoadItems(SimXmlReader reader, Diagram diagram, XElement elem)

at SoftwareIdeasModeler.Core.Projecting.Diagram.FromXElement(SimXmlReader reader, IDiagramOwner owner, XElement elem)

at SoftwareIdeasModeler.Core.Projecting.Folder.FromXElement(SimXmlReader reader, Project project, XElement elem)

at SoftwareIdeasModeler.ProjectXml.SimXmlReader.LoadFolders(XElement root)

at SoftwareIdeasModeler.ProjectXml.SimXmlReader.Load()

at SoftwareIdeasModeler.ProjectHelper.LoadProject(String localFileName, Boolean showReadOnlyWarning, Boolean checkFileVersion, Boolean processCustomDiagrams)

at SoftwareIdeasModeler.ProjectHelper.LoadProject(String filename, String repositoryPath)