Hello,

I can't build a graph using hc_add_series .

here is my code and data

```
origine mois moy
A 1 247563
A 2 241450
A 3 234070
A 4 261077
B 1 205313
B 2 253429
B 3 228813
B 4 221133
B 5 287067
B 6 231357
B 7 260688
B 8 295200
B 9 249867
B 10 227125
B 11 173200
B 12 138200
C 1 91438
C 2 112286
C 3 109267
C 4 96429
C 5 109250
C 6 115000
C 7 158200
C 8 198000
C 9 193933
C 10 141533
C 11 117800
C 12 92063
D 1 76800
D 2 71214
D 3 68000
D 4 93000
E 1 132471
E 2 125539
E 3 118503
E 4 117400
```

```
highchart()%>%
hc_chart(type='spline')%>%
hc_add_series(name ='Moyenne A',data=filter(df_graph,origine=='A')%>%select(moy),color='red')%>%
hc_add_series(name='Moyenne E',data=filter(df_graph,origine=='E')%>%select(moy),color='green')
```

and this the graph

thanks for your help !