diff --git a/datamodels/2.x/itop-core-update/src/Service/RunTimeEnvironmentCoreUpdater.php b/datamodels/2.x/itop-core-update/src/Service/RunTimeEnvironmentCoreUpdater.php
index 5164e428a..3c27c3fb3 100644
--- a/datamodels/2.x/itop-core-update/src/Service/RunTimeEnvironmentCoreUpdater.php
+++ b/datamodels/2.x/itop-core-update/src/Service/RunTimeEnvironmentCoreUpdater.php
@@ -150,7 +150,7 @@ class RunTimeEnvironmentCoreUpdater extends RunTimeEnvironment
 		foreach($this->oExtensionsMap->GetAllExtensions() as $oExtension) {
 			if ($oExtension->bMarkedAsChosen) {
 				foreach ($oExtension->aModules as $sModuleName) {
-					if (!isset($aRet[$sModuleName])) {
+					if (!isset($aRet[$sModuleName]) && isset($aAvailableModules[$sModuleName])) {
 						$aRet[$sModuleName] = $aAvailableModules[$sModuleName];
 					}
 				}