Fix

Author: sebastianbergmann

src/TextUI/Command.php

@@ -873,7 +873,7 @@ private function handleWarmCoverageCache(XmlConfiguration\Configuration $configu
         print 'Warming cache for static analysis ... ';
 
         (new CacheWarmer)->warmCache(
-            $cacheDirectory,
+            $cacheDirectory->path(),
             !$configuration->codeCoverage()->disableCodeCoverageIgnore(),
             $configuration->codeCoverage()->ignoreDeprecatedCodeUnits(),
             $filter