diff --git a/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php b/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php
index 1e5d4e7868a..9c2a1ab28f9 100644
--- a/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php
+++ b/src/Type/Php/DateIntervalDynamicReturnTypeExtension.php
@@ -28,16 +28,10 @@ public function isStaticMethodSupported(MethodReflection $methodReflection): boo
 
 	public function getTypeFromStaticMethodCall(MethodReflection $methodReflection, StaticCall $methodCall, Scope $scope): ?Type
 	{
-		$defaultReturnType = ParametersAcceptorSelector::selectFromArgs(
-			$scope,
-			$methodCall->getArgs(),
-			$methodReflection->getVariants(),
-		)->getReturnType();
-
 		$dateTimeString = $scope->getType($methodCall->getArgs()[0]->value);
 
 		if (!($dateTimeString instanceof ConstantStringType)) {
-			return $defaultReturnType;
+			return null;
 		}
 
 		$isValid = DateInterval::createFromDateString($dateTimeString->getValue()) !== false;