The Schema Tree throws a System.NullReferenceException as soon as I do the following (my working case):

1. Expand "HR"
2. Expand "Employees"
3. Select/Highlight "Email" TreeNode
4. Go to SearchBox and try to enter for example "emp"
5. ERROR: System.NullReferenceException: Object reference not set to an instance of an object.

This is the complete StackTrace:

ERROR: System.NullReferenceException: Object reference not set to an instance of an object.
at DevExpress.XtraTreeList.Nodes.TreeListNode.SetValue(Object columnID, Object val)
at DevExpress.XtraTreeList.Nodes.TreeListNode.set_Item(Object columnID, Object value)
at ActiveDatabaseSoftware.ActiveQueryBuilder.DevExpressCustomTreeView.SetNodeCaption(Object node, String caption) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\DevExpressControlFactory\DevExpressCustomTreeView.cs:line 309
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureTreeController.StructureItemUpdatedHandler(MetadataStructureItem item) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureTreeController.cs:line 241
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructure.DoItemUpdated(MetadataStructureItem item) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructure.cs:line 96
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.DoUpdated() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 224
at ActiveDatabaseSoftware.ActiveQueryBuilder.BatchUpdatableBase.EndUpdate() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Base Classes\BatchUpdatableBase.cs:line 42
at ActiveDatabaseSoftware.ActiveQueryBuilder.UpdateRegion.Dispose() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Interfaces\IBatchUpdatable.cs:line 39
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.SetActive(Boolean active) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 296
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.UnloadChildItems() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 78
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.SetActive(Boolean active) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 247
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.UnloadChildItems() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 78
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.Dispose() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 119
at ActiveDatabaseSoftware.ActiveQueryBuilder.UpdatableObjectList`1.Clear() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Base Classes\UpdatableObjectList.cs:line 120
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.Assign(Object source) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 196
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructure.Assign(Object source) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructure.cs:line 75
at ActiveDatabaseSoftware.ActiveQueryBuilder.QueryBuilder.set_MetadataStructure(MetadataStructure value) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Query Builder\QueryBuilder.cs:line 799
at ActiveDatabaseSoftware.ActiveQueryBuilder.QueryBuilder.QuickSearchTextChanged(String searchString) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Query Builder\QueryBuilder.cs:line 3538
at ActiveDatabaseSoftware.ActiveQueryBuilder.QueryBuilder.SearchTimer_Tick(Object sender, EventArgs e) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Query Builder\QueryBuilder.cs:line 3934
at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
ERROR: System.NullReferenceException: Object reference not set to an instance of an object.
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.Dispose() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 122
at ActiveDatabaseSoftware.ActiveQueryBuilder.UpdatableObjectList`1.RemoveAt(Int32 index) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Base Classes\UpdatableObjectList.cs:line 183
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.SetActive(Boolean active) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 288
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.UnloadChildItems() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 78
at ActiveDatabaseSoftware.ActiveQueryBuilder.MetadataStructureItem.Dispose() in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Metadata\Structure\MetadataStructureItem.cs:line 119
at ActiveDatabaseSoftware.ActiveQueryBuilder.Helpers.Free[T](T& o) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Helpers\Helpers.cs:line 1596
at ActiveDatabaseSoftware.ActiveQueryBuilder.QueryBuilder.Dispose(Boolean disposing) in c:\Users\User\Documents\git\toBrain.net\Src\ThirdParty\ActiveDatabaseSoftware\ActiveQueryBuilderNET\Query Builder\QueryBuilder.cs:line 1336
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.Windows.Forms.ContainerControl.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.Windows.Forms.ContainerControl.Dispose(Boolean disposing)
at toBrain.net.Editors.SqlQueryDesignerEditorControl.Dispose(Boolean disposing) in c:\Users\User\Documents\git\toBrain.net\Src\Shared\Shared.Design\Editors\SqlQueryDesignerEditorControl.cs:line 588
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.Windows.Forms.ContainerControl.Dispose(Boolean disposing)
at System.Windows.Forms.Form.Dispose(Boolean disposing)