Run Time error 91 while updating texts in textbox in userform

I have a userform with textboxes and listbox.

All new values from my textbox I am able to add from textbox to an excel sheet.

When it is coming for editing I am unable to update and save the edited data from textbox to that particular cell value.

Following is my code for saving edited datas from textbox to particular sheet cell

Privte sub button_save_Click()

      Dim Employee As Variant
      Dim Name As String
      Dim ws As Worksheet
      Set ws = Worksheets("hotel")
     
    
      
      Employee = Empty
      
      With ws.Range("c1:c900")
      
            Name = b.Value     ->     "// 'b' is the name of textbox
            
            
            Set Employee = .Find(what:=Name, LookIn:=xlValues)
            
            Employee.Rows.Offset(0, 0).Value = b.Value               "//While clicking save button after editing data in textbox I'm getting Run 
                                                                                                time error 91 here

      
      End With

      Set Employee = Nothing
 
End Sub

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While editing from "Ascot" to "Asco" I have no problem.
But when I type any new alphabet in the textbox like from "Ascot" to "Ascot Royal" I get the Run time error 91 message.

plz help. Thanks