diff --git a/server/config/custom.js b/server/config/custom.js
index 6608ee0a..a132e5ad 100644
--- a/server/config/custom.js
+++ b/server/config/custom.js
@@ -35,7 +35,7 @@ module.exports.custom = {
   oidcAudience: process.env.OIDC_AUDIENCE,
   oidcClientId: process.env.OIDC_CLIENT_ID,
   oidcRolesAttribute: process.env.OIDC_ROLES_ATTRIBUTE || 'groups',
-  oidcAdminRoles: process.env.OIDC_ADMIN_ROLES.split(',') || [],
+  oidcAdminRoles: process.env.OIDC_ADMIN_ROLES ? process.env.OIDC_ADMIN_ROLES.split(',') : [],
   oidcredirectUri: process.env.OIDC_REDIRECT_URI,
   oidcJwksUri: process.env.OIDC_JWKS_URI,
   oidcScopes: process.env.OIDC_SCOPES || 'openid profile email',