Supervisors must deal with employee errors on a regular basis and may resolve them by acting according to various behaviors, including error management or error avoidance. However, the relationship between supervisor behaviors when dealing with errors and their effect on employee mental health has been subject to limited study, despite an increasing focus on mental health in the workplace. In this thesis, the data I gathered from 244 survey respondents support a model that links supervisor error treatment behavior to the job stress experienced by employees. I discuss the theoretical and practical applications for mental health, leadership training, organizational productivity, and future research.