SBML generation fails because of error in GPML

Just going to report this here. I think it's really a GPML error, but it could be nice if the duplicate rdf:ID would be reported as error, instead of cause the SBML generation to cause an Internal Server Error.

xpath reports:

$ xpath -e "/sbml/model/notes/body/p/text()" sbml/WP4969.sbml 

not well-formed (invalid token) at line 1, column 0, byte 0:
{"reason":"Biopax publication with d5e already exists.","error":"Internal server error."}
^
 at /usr/lib/x86_64-linux-gnu/perl5/5.32/XML/Parser.pm line 187.

The SBML content returned is (which is indeed not SBML):

{"reason":"Biopax publication with d5e already exists.","error":"Internal server error."}