diff --git a/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php b/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php
index 3e1fd40823e..90842b37a05 100644
--- a/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php
+++ b/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php
@@ -12,6 +12,7 @@
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\Type;
 use function array_map;
+use function count;
 use function gettype;
 use function in_array;
 
@@ -44,6 +45,11 @@ public function getTypeFromStaticMethodCall(MethodReflection $methodReflection,
 			$strings,
 		);
 
+		// the error case, when wrong types are passed
+		if (count($possibleReturnTypes) === 0) {
+			return null;
+		}
+
 		if (in_array('boolean', $possibleReturnTypes, true) && in_array('object', $possibleReturnTypes, true)) {
 			return null;
 		}
diff --git a/tests/PHPStan/Analyser/data/bug-8442.php b/tests/PHPStan/Analyser/data/bug-8442.php
index e35ac0547fb..64ed0e66536 100644
--- a/tests/PHPStan/Analyser/data/bug-8442.php
+++ b/tests/PHPStan/Analyser/data/bug-8442.php
@@ -2,6 +2,7 @@
 
 namespace Bug8442;
 
+use stdClass;
 use function PHPStan\Testing\assertType;
 use DateInterval;
 
@@ -33,6 +34,7 @@ function () {
 
 	assertType('false', DateInterval::createFromDateString($interval));
 
-	DateInterval::createFromDateString();
+	assertType('DateInterval|false',DateInterval::createFromDateString());
+	assertType('DateInterval|false',DateInterval::createFromDateString(new stdClass()));
 };