diff --git a/packages/vitest/src/integrations/chai/jest-expect.ts b/packages/vitest/src/integrations/chai/jest-expect.ts
index 260c4928a69f..77a5fe0d1caf 100644
--- a/packages/vitest/src/integrations/chai/jest-expect.ts
+++ b/packages/vitest/src/integrations/chai/jest-expect.ts
@@ -548,7 +548,7 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
       )
     }
 
-    if ('asymmetricMatch' in expected && typeof (expected as any).asymmetricMatch === 'function') {
+    if (typeof expected === 'object' && 'asymmetricMatch' in expected && typeof (expected as any).asymmetricMatch === 'function') {
       const matcher = expected as any as AsymmetricMatcher<any>
       return this.assert(
         thrown && matcher.asymmetricMatch(thrown),
diff --git a/packages/vitest/src/integrations/chai/jest-utils.ts b/packages/vitest/src/integrations/chai/jest-utils.ts
index 66d75641d76c..ffc75a7c2635 100644
--- a/packages/vitest/src/integrations/chai/jest-utils.ts
+++ b/packages/vitest/src/integrations/chai/jest-utils.ts
@@ -38,7 +38,7 @@ export function equals(
 const functionToString = Function.prototype.toString
 
 export function isAsymmetric(obj: any) {
-  return !!obj && 'asymmetricMatch' in obj && isA('Function', obj.asymmetricMatch)
+  return !!obj && typeof obj === 'object' && 'asymmetricMatch' in obj && isA('Function', obj.asymmetricMatch)
 }
 
 export function hasAsymmetric(obj: any, seen = new Set()): boolean {