diff --git a/xCAT-server/lib/xcat/plugins/ipmi.pm b/xCAT-server/lib/xcat/plugins/ipmi.pm
index 9f2b13aeb..08ccfc13d 100644
--- a/xCAT-server/lib/xcat/plugins/ipmi.pm
+++ b/xCAT-server/lib/xcat/plugins/ipmi.pm
@@ -4163,17 +4163,19 @@ sub activatesession {
 			$error = "Requested maximum privilege level exceeds user and/of channel privilege limit";
 		}
 
-		$auth = $response[37];
-		if($auth == 0x00) {
-			$authoffset=16;
-		}
-		elsif($auth == 0x02) {
-		}
-		elsif($auth == 0x04) {
-		}
-		else {
-			$error = "activate session requested unsupported Authentication Type Support";
-		}
+        unless ($error) {
+    		$auth = $response[37];
+    		if($auth == 0x00) {
+    			$authoffset=16;
+    		}
+    		elsif($auth == 0x02) {
+    		}
+    		elsif($auth == 0x04) {
+    		}
+    		else {
+    			$error = "activate session requested unsupported Authentication Type Support";
+    		}
+        }
 
 ###check
 		@session_id = @response[38,39,40,41];