PlotmafSummary warning message

Hi, I got the following warning message while plotting plotmafSummary. And I am only getting the SNP variant plot in the graph. Please help me with this issue.

plotmafSummary(maf=oc, rmOutlier = TRUE, addStat= 'median', dashboard = TRUE, titvRaw= FALSE) Warning message: In titv(maf = maf, useSyn = TRUE, plot = FALSE) : Non standard Ti/Tv class: 1TRUE