Conflit lors de la création d'une figure contenant deux sous-figures et les \caption des autres figures

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\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\usepackage[a4paper,left=10mm,right=10mm,top=20mm,bottom=20mm]{geometry}
\usepackage{color}
\usepackage{tikz}
\usepackage{graphicx}
\DeclareGraphicsExtensions{.jpg,.pdf,.png}
\usepackage{pgfplots}
\usepackage{siunitx}
\usepackage{tabularx}
\usepackage{fancyhdr}
\pagestyle{fancy}
\usepackage{subcaption}
\begin{document}
\graphicspath{{./images/}}
\begin{figure}
  % Première figure
  \centering
  \begin{subfigure}[b]{.45\linewidth}
    \begin{tikzpicture}
      \begin{axis}[
        xlabel=volume de NaOH (mL),
        ylabel=$\sigma\, (\mu S.cm^{-1}$),
        mark size=0.5pt,
        width=0.7\textwidth]
        \addplot table [x=ml, y=Scm,col sep=semicolon]
        {dosage_conductimetrique_F127a8_essai1_20190226.txt};
      \end{axis}
    \end{tikzpicture}
    \caption{courbe de dosage}
    % Deuxième figure
  \end{subfigure}
  \begin{subfigure}[b]{.45\linewidth}
    \centering
    \includegraphics[clip,scale=0.50]{analyse_conductimetrie_origineplus_F127a8_essai1_20190226.jpg}
    \caption{Analyse de la courbe de conductimétrie de F127a8}
 
 
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