Puppeteer: JSHandles can be evaluated only in the context they were created!

A JSHandle is evaluated in a different execution context from its owner.

Error message

JSHandles can be evaluated only in the context they were created!

How this error happens

A handle belongs to the page and execution realm where it was created. A different page cannot use that reference as a local object.

The snippets use an open page and its running browser. The fix continues from the handles created before the failing call.

const otherPage = await browser.newPage();

const handle = await page.evaluateHandle(() => {
    return {
        count: 3,
    };
});

await otherPage.evaluate(
    (value) => value.count,
    handle
);

How to fix

Evaluate the handle in its owning page. If the other page needs the data, transfer a plain value instead of a handle.

const count = await page.evaluate(
    (value) => value.count,
    handle
);

await otherPage.evaluate(
    (value) => {
        window.count = value;
    },
    count
);

Things to keep in mind

Close otherPage and dispose handle after use. CDP reports an execution-context mismatch; BiDi reports a frame mismatch. Separate frames in one page also have separate realms.

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