Fix check for TYPO3_CONTEXT as the file itself cannot use TYPO3 classes in the current state

html/typo3conf/ext/ter/tx_ter_wsdl.php

@@ -38,7 +38,7 @@ define('TYPO3_mainDir', 'typo3/');
 $serviceLocation = $_SERVER['HTTP_HOST'] . 'index.php?id=ter';
 
 $wsdlFileName = 'tx_ter.wsdl';
-if (\TYPO3\CMS\Core\Utility\GeneralUtility::getApplicationContext() === 'Production/Stage') {
+if (getenv('TYPO3_CONTEXT') === 'Production/Stage') {
     $wsdlFileName = 'tx_ter.stage.wsdl';
 }