People join wrong companies all the time and quit in less than a year. Same goes for companies, plenty of people get laid off during their first year. It sucks but it also gives us more liquid labor market where employees and employers know that they can get out of bad relationships easily. (And it usually favors employers)

One or two stints like that are not a problem. Nor is gap in resume should be an issue. (Yes some old school managers want perfect resume but many more understand that people now take time off to explore other interests, travel, start their own ventures etc)