_WARN: Argument "\\n* ..." isn't numeric

[Alex]

Hi,
I'm using amavisd-new-2.11.0 on fedora25 with spamassassin-3.4.2 from
svn and just noticed I'm receiving a warning that I don't understand:

Feb  8 10:09:13 juggernaut amavis[26852]: (26852-07) _WARN: Argument
"\\n*  0.5 JMQ_SPF_NEUTRAL_ALL ASKDNS: SPF set to ?all!\\n*..." isn't
numeric in sprintf at /
usr/sbin/amavisd line 3889.

Feb  8 10:17:01 juggernaut amavis[7371]: (07371-01) _WARN: Argument
"\\n* -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://w..." isn't
numeric in sprintf at /us
r/sbin/amavisd line 3889.

These appear to be the result of some kind of parsing error? The "*
0.5 JMQ ..." is from the X-Spam-Report header:

X-Spam-Report:
 *  0.5 JMQ_SPF_NEUTRAL_ALL ASKDNS: SPF set to ?all!
 *      [mail176.atl121.mcsv.net TXT:v=spf1]
 [ip4:198.2.131.176 include:spf.mandrillapp.com]
 [?all]
 * -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no
 *      trust
 *      [198.2.131.176 listed in list.dnswl.org]
 ...