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assert: improve error check #17574

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assert: improve error check #17574

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9 changes: 6 additions & 3 deletions lib/internal/errors.js
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Original file line number Diff line number Diff line change
Expand Up @@ -342,11 +342,14 @@ class AssertionError extends Error {
red = '\u001b[31m';
}
const util = lazyUtil();

if (actual && actual.stack && actual instanceof Error)
if (typeof actual === 'object' && actual !== null &&
'stack' in actual && actual instanceof Error) {
actual = `${actual.name}: ${actual.message}`;
if (expected && expected.stack && expected instanceof Error)
}
if (typeof expected === 'object' && expected !== null &&
'stack' in expected && expected instanceof Error) {
expected = `${expected.name}: ${expected.message}`;
}

if (errorDiff === 0) {
let res = util.inspect(actual);
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