I was trying to plot a vertical line using ListPlot everything works perfectly:
MassPeaks = {{9.1, 0}, {9.1, 2}};
ListPlot[MassPeaks, Joined -> True]
However, if I change ListPlot to ListLogPlot my line disappears:
ListLogPlot[MassPeaks, Joined -> True]
shows the same axes but no line. Is this a bug or I am missing something?