No permission to call sandboxed `source_location(_2216,_2218)' error

[JCR]

Hi!
On https://swish.swi-prolog.org i get an error; it has not happened before with the same code. Maybe related to this? Sorry for the bad formatting (could not get </> or backticks to work for some reason on Safari mac).
Cheers/JCR

Code:

:- use_module(library(clpr)).
main:- {X = 1 + 2}, writeln(X).

Error:

No permission to call sandboxed `source_location(_2216,_2218)'
Reachable from:
    system:'$assert_load_context_module'(A,B,C)
    system:'$load_file'(A,B,C)
    system:'$load_files'(A,B,C)
    load_files(A,B)

[jan]

Has happened a few times before. Still need to figure out why, but the problem never reproduced. Fixed using a restart.

[JCR]

Thanks @jan!