diff --git a/pkg/common/storage/controller/auth.go b/pkg/common/storage/controller/auth.go
index c94e2de2a..94f18b3ae 100644
--- a/pkg/common/storage/controller/auth.go
+++ b/pkg/common/storage/controller/auth.go
@@ -82,7 +82,7 @@ func (a *authDatabase) CreateToken(ctx context.Context, userID string, platformI
 	const adminTokenMaxNum = 30
 	if platformID == constant.AdminPlatformID {
 		if len(kickedTokenKey) > adminTokenMaxNum {
-			kickedTokenKey = kickedTokenKey[:adminTokenMaxNum]
+			kickedTokenKey = kickedTokenKey[:len(kickedTokenKey)-adminTokenMaxNum]
 		} else {
 			kickedTokenKey = nil
 		}