diff --git a/htdocs/core/lib/admin.lib.php b/htdocs/core/lib/admin.lib.php
index 705cf304460..1f23e26b877 100644
--- a/htdocs/core/lib/admin.lib.php
+++ b/htdocs/core/lib/admin.lib.php
@@ -1311,7 +1311,7 @@ function unActivateModule($value, $requiredby = 1)
 	}
 
 	// Disable modules that depends on module we disable
-	if (!$ret && $requiredby && is_object($objMod) && is_array($objMod->requiredby)) {
+	if (!$ret && $requiredby && isset($objMod) && is_object($objMod) && is_array($objMod->requiredby)) {
 		$countrb = count($objMod->requiredby);
 		for ($i = 0; $i < $countrb; $i++) {
 			//var_dump($objMod->requiredby[$i]);