diff --git a/docs/src/test-api/class-testinfoerror.md b/docs/src/test-api/class-testinfoerror.md
index 194990079f..1af877d952 100644
--- a/docs/src/test-api/class-testinfoerror.md
+++ b/docs/src/test-api/class-testinfoerror.md
@@ -8,7 +8,7 @@ Information about an error thrown during test execution.
 * since: v1.49
 - type: ?<[TestInfoError]>
 
-Error cause. Set when there is a [cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) for the error. Will be null if there is no cause or if the cause is not an instance of [Error] (or its subclass).
+Error cause. Set when there is a [cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) for the error. Will be `undefined` if there is no cause or if the cause is not an instance of [Error]
 
 ## property: TestInfoError.message
 * since: v1.10
diff --git a/docs/src/test-reporter-api/class-testerror.md b/docs/src/test-reporter-api/class-testerror.md
index f9e695737c..ea3ea1db38 100644
--- a/docs/src/test-reporter-api/class-testerror.md
+++ b/docs/src/test-reporter-api/class-testerror.md
@@ -8,7 +8,7 @@ Information about an error thrown during test execution.
 * since: v1.49
 - type: ?<[TestError]>
 
-Error cause. Set when there is a [cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) for the error. Will be null if there is no cause or if the cause is not an instance of [Error] (or its subclass).
+Error cause. Set when there is a [cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) for the error. Will be `undefined` if there is no cause or if the cause is not an instance of [Error]
 
 ## property: TestError.message
 * since: v1.10
diff --git a/packages/playwright/src/reporters/base.ts b/packages/playwright/src/reporters/base.ts
index 5c09e4b704..9bb5da81f6 100644
--- a/packages/playwright/src/reporters/base.ts
+++ b/packages/playwright/src/reporters/base.ts
@@ -441,10 +441,8 @@ export function formatError(error: TestError, highlightCode: boolean): ErrorDeta
   if (parsedStack && !location)
     location = parsedStack.location;
 
-  if (error.cause) {
-    tokens.push();
-    tokens.push(indent(colors.dim('[cause]: ') + formatError(error.cause, highlightCode).message, '  '));
-  }
+  if (error.cause)
+    tokens.push(colors.dim('[cause]: ') + formatError(error.cause, highlightCode).message);
 
   return {
     location,
diff --git a/packages/playwright/types/test.d.ts b/packages/playwright/types/test.d.ts
index de361c7b89..ba48f00cb9 100644
--- a/packages/playwright/types/test.d.ts
+++ b/packages/playwright/types/test.d.ts
@@ -9155,7 +9155,7 @@ export interface TestInfoError {
   /**
    * Error cause. Set when there is a
    * [cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) for the
-   * error. Will be null if there is no cause or if the cause is not an instance of [Error] (or its subclass).
+   * error. Will be `undefined` if there is no cause or if the cause is not an instance of [Error]
    */
   cause?: TestInfoError;
 
diff --git a/packages/playwright/types/testReporter.d.ts b/packages/playwright/types/testReporter.d.ts
index 69d1c0578e..6807c7aec0 100644
--- a/packages/playwright/types/testReporter.d.ts
+++ b/packages/playwright/types/testReporter.d.ts
@@ -557,7 +557,7 @@ export interface TestError {
   /**
    * Error cause. Set when there is a
    * [cause](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) for the
-   * error. Will be null if there is no cause or if the cause is not an instance of [Error] (or its subclass).
+   * error. Will be `undefined` if there is no cause or if the cause is not an instance of [Error]
    */
   cause?: TestError;
 
diff --git a/tests/playwright-test/reporter-base.spec.ts b/tests/playwright-test/reporter-base.spec.ts
index 7eb41f29eb..dabb2bbaa4 100644
--- a/tests/playwright-test/reporter-base.spec.ts
+++ b/tests/playwright-test/reporter-base.spec.ts
@@ -156,12 +156,12 @@ for (const useIntermediateMergeReport of [false, true] as const) {
       expect(result.failed).toBe(1);
       const testFile = path.join(result.report.config.rootDir, result.report.suites[0].specs[0].file);
       expect(result.output).toContain(`       at ${testFile}:18:21`);
-      expect(result.output).toContain(`      [cause]: Error: outer-message`);
-      expect(result.output).toContain(`          at ${testFile}:14:25`);
-      expect(result.output).toContain(`        [cause]: Error: inner-message`);
-      expect(result.output).toContain(`            at ${testFile}:12:25`);
-      expect(result.output).toContain(`          [cause]: SpecialError: my-message`);
-      expect(result.output).toContain(`              at ${testFile}:7:31`);
+      expect(result.output).toContain(`    [cause]: Error: outer-message`);
+      expect(result.output).toContain(`       at ${testFile}:14:25`);
+      expect(result.output).toContain(`    [cause]: Error: inner-message`);
+      expect(result.output).toContain(`       at ${testFile}:12:25`);
+      expect(result.output).toContain(`    [cause]: SpecialError: my-message`);
+      expect(result.output).toContain(`       at ${testFile}:7:31`);
       expect(result.output).toContain('afterAll executed successfully');
     });