She warning message is stil returned. See https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/issues/137#note_54516

$RunOptions
[1] "list"

$StateEnd
[1] "IniStates" "monthly"   "GR"       

inherits(OutputsModel$RunOptions, "list")
[1] TRUE

inherits(OutputsModel$StateEnd, "list")
[1] FALSE

listCols <- x[sapply(x, inherits, "list")]

It works with "StateEnd" and not with "RunOptions" because StateEnd is a list with specific classes, which is not the case of RunOptions which a simple list. ```r $RunOptions [1] "list" $StateEnd [1] "IniStates" "monthly" "GR" ``` ```r inherits(OutputsModel$RunOptions, "list") [1] TRUE inherits(OutputsModel$StateEnd, "list") [1] FALSE ``` In [SeriesAggreg.list, the code line is](https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/blob/dev/R/SeriesAggreg.list.R#L103): ```r listCols <- x[sapply(x, inherits, "list")] ```