Mapping node negates noise texture for unknown reason

I’m following a setup to texture some particles. It involves the following nodes:

However, the noise texture only seems to show up if I remove the mapping node, which I’m not supposed to. Otherwise, it’s just white like this. All my values are set to the tutorial’s suggested values, and all connections are set up exactly like theirs. According to them, the noise texture should be visible on the sphere. (I’m on rendered view, as prescribed) I can’t delete the mapping node if I want this to turn out right. Can you spot what may be wrong with this set up that the noise texture isn’t showing?

You have the scale set to 0 (the value node) 0 means zero, no scale, nothing.

(well it will give you a single random greyscale value)

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