IF you're running a legit CKD or PSMF or any of the other various "carbs are the devil" diets, then, no, you shouldn't be eating fruit. If, however, you've simply lowered your calories and fat and carbs are the sources from which you took to lower them, then some fruit is fine. All you have to do is remove some oatmeal or whatever in order to compensate for the new calories.
What I mean is, if you're eating 3k calories/day and you want a banana, then you eat a little less of something else so you can eat the banana and still be at the 3k level.