Avoid having "Missing character: There is no ; in font nullfont!" warnings

[cserpell]

When using bayesnet, many warnings like the following appear, even when running pdflatex on the example example.tex file. Is there any way to avoid them?

Missing character: There is no ; in font nullfont!

These are my logs (everything installed by ubuntu packages):

$ pdflatex example.tex 
This is pdfTeX, Version 3.141592653-2.6-1.40.24 (TeX Live 2022/Debian) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
(./example.tex
LaTeX2e <2022-06-01> patch level 5
L3 programming layer <2022-07-15>
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Document Class: article 2021/10/04 v1.4n Standard LaTeX document class
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ex)) (/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-latex.def
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorequick.code.tex
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreshade.code.tex
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreimage.code.tex

(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreexternal.code.
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorelayers.code.te
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoretransparency.c
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorerdf.code.tex))
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleshapes.code.tex
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(/usr/share/texlive/texmf-dist/tex/latex/pgf/math/pgfmath.sty
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmodulematrix.code.tex
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibrarytopaths.code.tex)))
(/usr/share/texlive/texmf-dist/tex/latex/tikz-bayesnet/tikzlibrarybayesnet.code
.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.geometric.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.geometric.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.misc.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.misc.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.symbols.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.arrows.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.callouts.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.callouts.code.tex))
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s.multipart.code.tex)))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryfit.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibrarychains.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibrarypositioning.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryarrows.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/pgflibraryarrows.code.
tex))) (/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def)
 (./example.aux)
(/usr/share/texlive/texmf-dist/tex/context/base/mkii/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
) (/usr/share/texlive/texmf-dist/tex/latex/epstopdf-pkg/epstopdf-base.sty
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))

LaTeX Font Warning: Font shape `OMS/cmtt/m/n' undefined
(Font)              using `OMS/cmsy/m/n' instead
(Font)              for symbol `textbackslash' on input line 38.

Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
(./model_pca.tex
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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) (./model_pca2.tex
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
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) (./model_lda.tex
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
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) (./model_citation_influence.tex
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
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Missing character: There is no ; in font nullfont!
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) [1{/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}] [2] [3] [4]
(./example.aux)

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Output written on example.pdf (4 pages, 192757 bytes).
Transcript written on example.log.