Has anyone ever received the attached error when using predict_insample? My "big" dataframe has columns=["unique_id", "ds", "y"] with about 150 unique "unique_id"s, the smallest time-series has ~30 datapoints, the biggest time-series has ~1800 datapoints, ~90k datapoints in total. No NaNs. No exogenous covariates.

Hi @J.! I believe it is caused by the short time series. The output is longer than the smallest time series. Can you try (for debugging) keeping only the longest time-series and see if the issue disappears?

Setting the size of each timeseries to the size of the smallest time series resolved the error. Thanks!