VB.NET NullReferenceException Timer.Start ()

I miss the following error, and I do not understand the reason ...

I have changed the access to Public of all timers in case that was the problem and nothing ...

'Block timers
Private Sub blocktimers()
    Dim i As Integer
    For Each c As Timer In Me.components.Components
        If TypeOf c Is Timer Then
            If c.Enabled And c.Interval <> 210 Then
                carray(i) = c
                ReDim Preserve carray(i + 1)
                c.Stop()
            End If
        End If
    Next
End Sub

'Release timers
Private Sub releasetimers()
    For Each c As Timer In carray
        c.Start()
    Next
End Sub

Reviewing point to point, I have seen that at some point it detects c with the value Nothing.

I've added an If c IsNot Nothing Then, before c.Start ()

Now the error does not jump and the application does not get stuck but if I put a break point in each sub, I see that releasetimers () only activates 1 timer, the value of the second timer it finds is nothing and leaves the sub, while blocktimers () is stopping more than 10 timers ...

Greetings and thank you very much!