diff --git a/src/Command/CoreListerVersions.php b/src/Command/CoreListerVersions.php
index 15c89e9..b3c6498 100644
--- a/src/Command/CoreListerVersions.php
+++ b/src/Command/CoreListerVersions.php
@@ -159,10 +159,13 @@ class CoreListerVersions extends Command {
 	 * @return string	$version
 	 */
 	public static function trouverVersionInstallee() {
-		if (lire_fichier('ecrire/inc_version.php', $inc)) {
-			preg_match('/\$spip_version_branche = \'(\d+.\d+.\d+)\';/', $inc, $matches);
+		global $spip_loaded;
+		if ($spip_loaded) {
+			if (lire_fichier('ecrire/inc_version.php', $inc)) {
+				preg_match('/\$spip_version_branche = \'(\d+.\d+.\d+)\';/', $inc, $matches);
 
-			return $matches[1];
+				return $matches[1];
+			}
 		}
 	}
 }