no. The change in moment is zero, as you can see on your plot.
I think you can see if you imagine sectioning the beam slightly to the right of the support and constructing a free body diagram, the moment there is not zero. the support does not provide any concentrated moment, so the moment does not change there and so the moment at the support can not be zero.
Bending moment is the area under the shear diagram which is definitely increasing by a slope of 5kn/m as it gets closer to support in a straight line, so it is maximum on the support. And this moment is balanced by the reaction of roller.
If you remove the continuity in beam over the roller and allow a joint there thus removing the moment there, the cantilever part will immediately lose its equlibrium and rotate clockwise down and will turn into a pendelum swinging back and forth!