Macro saved as CSV stops Macro from working - excel

Question

I'm working on a Macro that makes several CSV files from a certain area while applying a filter. There are two issues.
The workbook will be saved as a file-format retrieved from it's name (cell B15 and the word 'Week')
I cannot find a way to loop this Macro until Cell B15 is empty.
Can anyone help? Thanks in advance.
Example wrong format:
Sub CSVMaker()
'
' CSVMaker Macro
'
'
ActiveSheet.Range("$A$17:$M$240000").AutoFilter Field:=2, Criteria1:="<>"
Range("A18:B18").Select
Range(Selection, Selection.End(xlDown)).Select
Range(Selection, Selection.End(xlDown)).Select
Selection.Copy
Sheets.Add.Name = Range("A10").Value & "." & Range("A7").Value & "." & "Week" & Range("B15").Value
ActiveSheet.Paste
Application.CutCopyMode = False
Application.DisplayAlerts = False
ActiveSheet.Copy
ActiveWorkbook.SaveAs Filename:=ActiveSheet.Name, FileFormat:=xlCSV, CreateBackup:=True
ActiveWorkbook.Close
Application.DisplayAlerts = True
Sheets("Input").Select
Columns("B:B").Select
Range("B6").Activate
Selection.Delete Shift:=xlToLeft
End Sub

Answer 1

So finally the answer is the filename needs a correct extension like Filename:=ActiveSheet.Name & ".csv".
And I recommend to avoid .Select and do the following:
Option Explicit
Public Sub CSVMaker()
Dim ws As Worksheet
Set ws = ActiveSheet 'better ThisWorkbook.Worksheets("your-sheet-name")
ws.Range("$A$17:$M$240000").AutoFilter Field:=2, Criteria1:="<>"
ws.Range("A18:B18", ws.Range("A18:B18").End(xlDown).End(xlDown)).Copy
Dim SheetName As String
SheetName = ws.Range("A10").Value & "." & Range("A7").Value & "." & "Week" & Range("B15").Value
ThisWorkbook.Sheets.Add.Name = SheetName
ThisWorkbook.Sheets(SheetName).Paste
Application.CutCopyMode = False
Application.DisplayAlerts = False
ThisWorkbook.Sheets(SheetName).Copy
ActiveWorkbook.SaveAs Filename:=SheetName & ".csv", FileFormat:=xlCSV, CreateBackup:=True
ActiveWorkbook.Close
Application.DisplayAlerts = True
ThisWorkbook.Sheets("Input").Columns("B:B").Delete Shift:=xlToLeft
End Sub