luatodonotes and tikz externalization won't mix

Question

Consider the following code:

documentclass[11pt]{report}
\usepackage{pgfplots}
\usepgfplotslibrary{external}
\tikzexternalize

%\usepackage{luatodonotes}

\begin{document}

\begin{tikzpicture} 
    \begin{axis}
    \addplot[mark=x] coordinates {
        (2,-2)
        (3,-3)
        (4,-4)
        (5,-5)
    };
    \end{axis}
\end{tikzpicture}

\end{document}

When this compiled using LuaLaTeX,

lualatex -enable-write18 lualatex-externalize-luatodonotes.tex

everything goes OK, with the TikZ image externalized as it should be. However, uncommenting the luatodonotes line, compilation exits with an error and no result is produced.

The lualatex-externalize-luatodonotes.log file ends with:

Package pgfplots Warning: running in backwards compatibility mode (unsuitable t
ick labels; missing features). Consider writing \pgfplotsset{compat=1.11} into 
your preamble.
 on input line 8.

\AtBeginShipoutBox=\box259
===== 'mode=convert with system call': Invoking 'lualatex -halt-on-error -inter
action=batchmode -jobname "lualatex-externalize-luatodonotes-figure0" "\def\tik
zexternalrealjob{lualatex-externalize-luatodonotes}\input{lualatex-externalize-
luatodonotes}"' ========
runsystem(lualatex -halt-on-error -interaction=batchmode -jobname "lualatex-ext
ernalize-luatodonotes-figure0" "\def\tikzexternalrealjob{lualatex-externalize-l
uatodonotes}\input{lualatex-externalize-luatodonotes}")...executed.


!LuaTeX error (file lualatex-externalize-luatodonotes-figure0.pdf): xpdf: readi
ng PDF image failed
 ==> Fatal error occurred, no output PDF file produced!

The lualatex-externalize-luatodonotes-figure-0.log file ends with:

\providecommand \oddpage@label [2]{}
{C:/Users/vladimir/AppData/Local/MiKTeX/2.9/pdftex/config/pdftex.map}]
A tikzpicture has been optimized away. Use '/tikz/external/optimize=false' to d
isable this.
! LuaTeX error ...iKTeX 2.9/tex/lualatex/luatodonotes/luatodonotes.lua:350: bad
 argument #1 to 'pairs' (table expected, got nil)
stack traceback:
    [C]: in function 'pairs'
    ...iKTeX 2.9/tex/lualatex/luatodonotes/luatodonotes.lua:350: in function 'clea
rNotes'
    <\directlua >:1: in main chunk.
<argument> ...irectlua {luatodonotes.clearNotes()}
                                                  \EndCatcodeRegime \AtBegSh...
l.21 \end{document}


Here is how much of LuaTeX's memory you used:
 22848 strings out of 495011
 100000,794899 words of node,token memory allocated
 1681 words of node memory still in use:
    nodes
   avail lists: 2:20,3:240,4:193,7:2,9:76,10:1
 25515 multiletter control sequences out of 65536+200000
 28 fonts using 1112699 bytes
 63i,11n,76p,820b,1808s stack positions out of 5000i,500n,10000p,200000b,50000s
!  ==> Fatal error occurred, no output PDF file produced!

I have tried this with both MikTeX and TexLive on Windws 7 64 bit with the same outcome.

How can this be resolved? I would like to use luatodonotes in my book. I also need to use LuaLaTeX.