flexsurvreg with gamma distribution produced NaN warnings. Other distributions work. How can I fix that?

General
1

I am trying to fit a gamma distribution to a specific dataset:
fit_gamma<- flexsurvreg(Surv(time,event) ~ 1, data=mydataset, dist='gamma')

All other distributions work (gengamma, llogis, lnorm,...), only gamma produces below warning messages:

Warning messages:
1: In (function (q, shape, rate = 1, scale = 1/rate, lower.tail = TRUE, :
NaNs produced
2: In (function (q, shape, rate = 1, scale = 1/rate, lower.tail = TRUE, :
NaNs produced

Sarah1 on May 27th asked a similar question (topic: "flexsurv " does not work
but I do not see the answer to fix the NaNs.

Could anybody please help?
Thank you very much!

2

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