potentially fixed bug in MultiFormatTextBox which lead to application crash

3 years ago · c7ac429976
parent 12a3b6792f
commit c7ac429976
1 changed files with 1 additions and 1 deletions
--- a/MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.cs
+++ b/MultiTerm.Wpf.CustomControl/MultiFormatTextBox/MultiFormatTextBox.cs
@ -83,7 +83,7 @@ public class MultiFormatTextBox : Control
    ~MultiFormatTextBox()
    {
        // unregister events
-        if (this.CurrentMultiFormatString is INotifyCollectionChanged incc)
+        if (this.CurrentMultiFormatString != null && this.CurrentMultiFormatString is INotifyCollectionChanged incc)
        {
            incc.CollectionChanged -= this.MultiFormatString_CollectionChanged;
        }