Fixes #2583

src/headless/plugins/disco/utils.js

@@ -129,6 +129,6 @@ export function clearSession () {
     _converse.disco_entities?.forEach(e => e.identities.clearStore());
     _converse.disco_entities?.forEach(e => e.dataforms.clearStore());
     _converse.disco_entities?.forEach(e => e.fields.clearStore());
-    _converse.disco_entities.clearStore();
+    _converse.disco_entities?.clearStore();
     delete _converse.disco_entities;
 }