javascript error when plot was never saved and there is a young plant.

[cookie-crumb]

Mature plant are not harvested when a young plant remain and there is no saved plot.
replace
let [seedId, age] = config.savedPlot[y][x];
with
let [seedId, age] = (config.savedPlot.length > 0) ? config.savedPlot[y][x] : [0, 0];