The phrase "missing comma" means that a comma is supposed to be used in a sentence but it was left out. This can change the meaning of the sentence or make it harder to understand. Full definition
In my industry (public accounting), a few missed commas means the difference between thousands and millions of dollars for our clients and THAT's NOT acceptable — so... NO, there isn't anything more important on a candidate's resume than their ability to spell - check, self - review, and oh yeah, meet all the other criteria that are required for consideration for a job. (impacthiringsolutions.com)
Readers are just as likely (if not more likely) to hate a story for a plot hole or a Too Stupid To Live character as for missing commas or repeated words. (jamigold.com)
I think my biggest editing frustration are the little things: I can see gaping plot holes, but I often miss the commas and semicolons that are out of place. (selfpublishingteam.com)