diff --git a/src/core/siteplugins/providers/siteplugins.ts b/src/core/siteplugins/providers/siteplugins.ts
index 6ebcef76a..7b3b9c03b 100644
--- a/src/core/siteplugins/providers/siteplugins.ts
+++ b/src/core/siteplugins/providers/siteplugins.ts
@@ -336,6 +336,8 @@ export class CoreSitePluginsProvider {
      */
     invalidateCallWS(method: string, data: any, preSets?: CoreSiteWSPreSets, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
+            preSets = preSets || {};
+
             return site.invalidateWsCacheForKey(preSets.cacheKey || this.getCallWSCacheKey(method, data));
         });
     }