Error when running prediction on several spots

[ff6347]

When running FHpredict on

• spot 56
• spot 57
• spot 58
• spot 59
• spot 60

for user 11 I get the following error.

"Error in summarise_impl(.data, dots, environment(), caller_env()) : \n  attempt to bind a variable to R_UnboundValue\n"

[ff6347]

From @wseis came the hint that R >= 4 with dplyr < 1 the possible source of this problem is. We are using r 4.0.2 with dplyr 0.8.3 from the MS snapshot from 2019-12-18. Which snapshot should we use?
See https://github.com/technologiestiftung/flusshygiene/blob/master/packages/opencpu-base/Dockerfile