Hi everyone

I have 2 data series on an XY scattergraph. I have created buttons for
turning the associated trendlines ON/OFF.
Trendline 1 is the trendline for series 1.
The sheet opens with trendline 1 on and trendline 2 off
One button (A) turns trendline 1 off and trendline 2 on
The other button (B) does the opposite (turns trendline 2 off and trendline
1 on)
The idea is that one trendline replaces the other.
However, if the user clicks the 'wrong button' (e.g clicks A when trendline
1 is already off) I get a runtime error 1004 (unable to get the trendline
properties of the series class). Fair enough.
What is the simplest way to trap this error?

Existing code attached to one of the buttons ('1 off, 2 on')

ActiveSheet.ChartObjects("Chart 7").Activate
   ActiveChart.SeriesCollection(1).Trendlines(1).Select
   Selection.Delete
   ActiveChart.SeriesCollection(2).Select
   ActiveChart.SeriesCollection(2).Trendlines.Add(Type:=xlLinear,
Forward:=0, _
       Backward:=0, DisplayEquation:=False, DisplayRSquared:=False).Select

Thanks for your help.

Phil