This is true, sometimes you cant get the current on the terminals of a transistor, to get around this problem I put a dummy resistor "R = 1m or so ", and get tthe current on it's terminal....
One last thing, make sure that the current you want to plot is saved, by default only voltages are saved.
In the ADE from outputs --> save all : check all button in first 4 options, or simply from outputs --> to be saved, choose the current to save..