Plot pandas pivot table with nan values as line connecting (ignoring gaps)

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Python

DataFrame

I have made a pivot table for 4 columns. I have to plot the chart of that table.But at some places there is value NaN, which is making the plot to have gaps in between I want all the gaps to appear a line between the previous and forward point. Lets say my pivot dataframe is pivot_1

pivot_1.plot()

is showing gaps in between. Please solve this problem?

What I have tried:

pivot_1=df.pivot_tabel(index='Week', columns='Time', aggfunc='mean', values='Temp')

pivot_1.plot(use_index=True)