If not averse to using mods, Ani's Business as Unusual mod for that store set fixes this and other unwanted behavior. The mod is now hosted at NRaas since her retirement; we have also released an updated version that fixed other bugs that the mod originally had. The mod requires that the oven and the customer table menus be replaced with her versions, which should show up in Build/Buy alongside of the originals.
http://nraas.wikispaces.com/Business+As+Unusual+Bistro
Without the mod, the only thing you can do is try changing the lot type around. Some of them work better than others, but without the mod many of us got this issue with some degree of frequency regardless.
