Failure to create dynesty run plot at checkpoint

I am running bilby_pipe on LHO. I get a bilby warning message, copied below, every time the job checkpoints. I don't know if this is just a pdfTex version thing or something, but I think if this happens once then there should be some switch to turn off plotting attempts at subsequent checkpoints.

@colm.talbot @gregory.ashton

14:59 bilby WARNING : Failed to create dynesty run plot at checkpoint
15:09 bilby INFO    : Written checkpoint file bilby_output_lal_downsampling/result/GW150914_data0_1126259462-391_analysis_H1L1_dynesty_par0_resume.pickle
15:09 bilby WARNING : latex was not able to process the following string:
b'$\\\\times\\\\mathdefault{10^{124}}\\\\mathdefault{}$'

Here is the full report generated by latex:
This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013)
 restricted \write18 enabled.
entering extended mode

(/home/isobel.romero-shaw/.cache/matplotlib/tex.cache/6c2d20fca0f523ac4d5ece2aa
c1da2f1.tex
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for english, dumylang, nohyphenation, lo
aded.
(/usr/share/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texlive/texmf-dist/tex/latex/type1cm/type1cm.sty)
(/usr/share/texlive/texmf-dist/tex/latex/base/textcomp.sty
(/usr/share/texlive/texmf-dist/tex/latex/base/ts1enc.def))
(/usr/share/texlive/texmf-dist/tex/latex/base/inputenc.sty
(/usr/share/texlive/texmf-dist/tex/latex/base/utf8.def
(/usr/share/texlive/texmf-dist/tex/latex/base/t1enc.dfu)
(/usr/share/texlive/texmf-dist/tex/latex/base/ot1enc.dfu)
(/usr/share/texlive/texmf-dist/tex/latex/base/omsenc.dfu)
(/usr/share/texlive/texmf-dist/tex/latex/base/ts1enc.dfu)))
(/usr/share/texlive/texmf-dist/tex/latex/geometry/geometry.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/share/texlive/texmf-dist/tex/generic/oberdiek/ifpdf.sty)
(/usr/share/texlive/texmf-dist/tex/generic/oberdiek/ifvtex.sty)
(/usr/share/texlive/texmf-dist/tex/generic/ifxetex/ifxetex.sty)

Package geometry Warning: Over-specification in `h'-direction.
    `width' (5058.9pt) is ignored.


Package geometry Warning: Over-specification in `v'-direction.
    `height' (5058.9pt) is ignored.

) (./6c2d20fca0f523ac4d5ece2aac1da2f1.aux)
(/usr/share/texlive/texmf-dist/tex/latex/base/ts1cmr.fd)
*geometry* driver: auto-detecting
*geometry* detected driver: dvips
! Undefined control sequence.
l.14 ...}{20.000000}{\rmfamily $\times\mathdefault
                                                  {10^{124}}\mathdefault{}$}
No pages of output.
Transcript written on 6c2d20fca0f523ac4d5ece2aac1da2f1.log.