Williams v. Glash

After a car accident with Glash (defendant), Margaret Williams (plaintiff) contacted his insurer, State Farm, about her car's damage. State Farm had her sign a claim form that included a release of personal-injury claims and paid her a check equal to the car damage. Williams later developed neck and back injuries from the accident and sued Glash. Glash moved for summary judgment based on the release; the trial court granted it and the court of appeals affirmed. Williams appealed.

Whether a contractual release of claims may be avoided when the parties signed it under a mutual misconception or ignorance of a material fact, such as an unknown personal injury.