diff --git a/src/Runner/Phpt/TestCase.php b/src/Runner/Phpt/TestCase.php
index dad0f48f990..5d2bafe2f14 100644
--- a/src/Runner/Phpt/TestCase.php
+++ b/src/Runner/Phpt/TestCase.php
@@ -27,6 +27,7 @@
 use function preg_replace;
 use function preg_split;
 use function realpath;
+use function sprintf;
 use function str_contains;
 use function str_starts_with;
 use function strncasecmp;
@@ -349,6 +350,24 @@ private function shouldTestBeSkipped(array $sections, array $settings): bool
             $output = $this->runCodeInLocalSandbox($skipIfCode);
         }
 
+        if (str_contains($output, 'Parse error:')) {
+            EventFacade::emitter()->testRunnerTriggeredPhpunitWarning(
+                sprintf(
+                    'SKIPIF section triggered a parse error: %s',
+                    $output,
+                ),
+            );
+        }
+
+        if (str_contains($output, 'Fatal error:')) {
+            EventFacade::emitter()->testRunnerTriggeredPhpunitWarning(
+                sprintf(
+                    'SKIPIF section triggered a fatal error: %s',
+                    $output,
+                ),
+            );
+        }
+
         if (strncasecmp('skip', ltrim($output), 4) === 0) {
             $message = '';
 
diff --git a/tests/_files/skip-if-requires-code-coverage-driver.php b/tests/_files/skip-if-requires-code-coverage-driver.php
index 6d30f0d7ac8..86d8a6c289a 100644
--- a/tests/_files/skip-if-requires-code-coverage-driver.php
+++ b/tests/_files/skip-if-requires-code-coverage-driver.php
@@ -24,6 +24,8 @@
 
 if (!extension_loaded('xdebug')) {
     print 'skip: This test requires a code coverage driver';
+
+    return;
 }
 
 if (version_compare(phpversion('xdebug'), '3.1', '>=') && in_array('coverage', xdebug_info('mode'), true)) {
diff --git a/tests/end-to-end/_files/phpt-skipif-invalid-require.phpt b/tests/end-to-end/_files/phpt-skipif-invalid-require.phpt
new file mode 100644
index 00000000000..8f1057cd740
--- /dev/null
+++ b/tests/end-to-end/_files/phpt-skipif-invalid-require.phpt
@@ -0,0 +1,12 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/6311
+--SKIPIF--
+<?php declare(strict_types=1);
+require __DIR__ . '/some/non/existing/file.php';
+
+--FILE--
+<?php declare(strict_types=1);
+
+echo "hello world\n";
+--EXPECT--
+hello world
diff --git a/tests/end-to-end/_files/phpt-skipif-parse-error.phpt b/tests/end-to-end/_files/phpt-skipif-parse-error.phpt
new file mode 100644
index 00000000000..f4a1ccceded
--- /dev/null
+++ b/tests/end-to-end/_files/phpt-skipif-parse-error.phpt
@@ -0,0 +1,11 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/5991
+--SKIPIF--
+<?php
+if (rand(0,1)) // intentional PHP Parse error (missing opening curly brace)
+}
+--FILE--
+<?php declare(strict_types=1);
+echo 'hello world';
+--EXPECTF--
+hello world
diff --git a/tests/end-to-end/regression/5991.phpt b/tests/end-to-end/regression/5991.phpt
new file mode 100644
index 00000000000..d70be538ffc
--- /dev/null
+++ b/tests/end-to-end/regression/5991.phpt
@@ -0,0 +1,28 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/5991
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = __DIR__ . '/../_files/phpt-skipif-parse-error.phpt';
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+.                                                                   1 / 1 (100%)
+
+Time: %s, Memory: %s
+
+There was 1 PHPUnit test runner warning:
+
+1) SKIPIF section triggered a parse error: 
+Parse error: Unmatched '}' in Standard input code on line 3
+
+
+OK, but there were issues!
+Tests: 1, Assertions: 1, PHPUnit Warnings: 1.
diff --git a/tests/end-to-end/regression/6311.phpt b/tests/end-to-end/regression/6311.phpt
new file mode 100644
index 00000000000..5b71c2e7453
--- /dev/null
+++ b/tests/end-to-end/regression/6311.phpt
@@ -0,0 +1,27 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/6311
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = __DIR__ . '/../_files/phpt-skipif-invalid-require.phpt';
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+.                                                                   1 / 1 (100%)
+
+Time: %s, Memory: %s
+
+There was 1 PHPUnit test runner warning:
+
+1) SKIPIF section triggered a fatal error: 
+Warning: require(%afile.php): Failed to open stream: No such file or directory in Standard input code on line %d
+
+Fatal error: Uncaught Error: Failed opening required%a
+%A