"Every sixty seconds you spend worrying is a minute of happiness you'll never get back"
The crack is in a strange place but since it serves no function (like support for the neck) it may even break off completely with no ill effect other than cosmetics.
If it were mine, I'd check to see if it's a crack in the paint or all the way through the wood making it jiggle. If it's all the way through I'd just glue it back with quick-glue and touch up the crack with a little black paint.
You may want to remove the neck first to prevent the glue from wicking to the neck, and it will also help you determine the depth of the crack.
I'm sure there are other people who will say to just break it off because it will add to the "mojo" of the bass. (I'm not one of them)
best of luck

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. . . anything's possible, . . . I suppose . . .
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Fender Jazz Bass Club #604, Avatar Club #261, MarkBass Club #351, Colorado #50