In about a month I will be presenting a poster among 100+ people in an international congress. However, I'm just realizing that I made a huge mistake in the abstract I sent (accepted of course), concerning a whole phrase (15 words) with numerical results. This doesn't change my overall conclusion, because combined with the other numerical results that I offered (which are fine, no mistakes), I reach the same observations.
I'm a last year undergraduate student in STEM, and I'm about to tell my advisor hoping for the best. But before I tell them, should I be prepared to send a correction to the organizers? I've been browsing the stack for a while and people seem to be super light on posters at conferences, so what are your thoughts?