[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Runtime](./puppeteer.protocol.runtime.md) > [EvaluateRequest](./puppeteer.protocol.runtime.evaluaterequest.md) > [throwOnSideEffect](./puppeteer.protocol.runtime.evaluaterequest.throwonsideeffect.md) ## Protocol.Runtime.EvaluateRequest.throwOnSideEffect property Whether to throw an exception if side effect cannot be ruled out during evaluation. This implies `disableBreaks` below. Signature: ```typescript throwOnSideEffect?: boolean; ```