The ornamental design of a stovetop burn guard, as shown and described.
FIG. 1 is a left rear perspective view of a stove top burn guard showing my
new design, the hand and stove shown in broken lines are for illustrative
purposes only and form no part of the claimed design;
FIG. 2 a front elevation view thereof;
FIG. 3 a top plan view thereof; and
FIG. 4 is a right side elevational view thereof, the left side being a
mirror image.