diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 8207fbb7a..398476031 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -2725,7 +2725,7 @@ EOF;
 			file_put_contents($sThemeDir.'/theme-parameters.json', json_encode($aThemeParameters));
 		}
 
-		if($oThemeNodes->count() === 0)
+		if($oThemeNodes->length === 0)
 		{
 			$aDefaultThemeInfo = $this->GetDefaultThemeInformation();
 			$sThemeDir = $sThemesDir.$aDefaultThemeInfo['name'];