Apex Chart stopped working a few days ago

I had an Apex chart which showed the forecast solar for today and tomorrow, along with a bar chart of the achieved solar production.

About a week or so ago the chart suddenly stopped working. Now it just says Loading…
If I open the editor then close it again the bar chart shows, but the solar forecast never does.

Can anyone see what might have broken?

Here is the code for the chart:

type: custom:apexcharts-card
header:
  show: true
  title: Forecast Generation - Today & Tomorrow
series:
  - entity: sensor.solcast_pv_forecast_forecast_today
    name: Today
    color: darkorange
    stroke_width: 3
    type: line
    time_delta: +15min
    extend_to: false
    yaxis_id: kWh
    show:
      legend_value: false
      in_header: false
    data_generator: |
      return entity.attributes.detailedForecast.map((entry) => {
            return [new Date(entry.period_start), entry.pv_estimate];
          });
  - entity: sensor.solcast_pv_forecast_forecast_tomorrow
    name: Tomorrow
    color: gold
    stroke_width: 3
    type: line
    time_delta: +15min
    extend_to: false
    yaxis_id: kWh
    show:
      legend_value: false
      in_header: false
    data_generator: |
      return entity.attributes.detailedForecast.map((entry) => {
            return [new Date(entry.period_start), entry.pv_estimate];
          });
  - entity: sensor.pv_energy_today
    name: Actual
    color: grey
    type: column
    group_by:
      func: diff
      start_with_last: true
    show:
      legend_value: false
now:
  show: true
  label: now
yaxis:
  - id: kWh
    show: true
    min: 0
    max: 5
    apex_config:
      tickAmount: 10
graph_span: 48h
span:
  start: day

Works straight, must be something besides APEX I’d say, I bet you checked your forecast entities in case these did become unavailable for some reason?

Ah yes, you’re right. I thought there was data in the solcast forecast entity, but it turns out solcast is not initialising. That’s where the error is. Many thanks!