Window buffer memory: Key parameter is empty

Questions
1

Hi, strange problem here.
i am trying to do an agent that uses whatsapp and memory, in the window buffer memory i used as key the wa_id from the whatsapp trigger (i mapped it graphically so i am sure the expression is okay). if i test the workflow everything goes fine and from the window buffer memory i can see the wa_id mapped and the output so its fine. But when i switch to activate if i go on executions i see some errors saying that the window buffer memory have not found the key. how is this even possible? when a whatsapp trigger is received, it is impossible that the workflow does not see the wa_id, what am i doing wrong?
i give you a screenshot of both the workflow in test mode and another screenshot with the live workflow.

Screenshot 2025-05-02 at 18.38.52
Screenshot 2025-05-02 at 18.38.521920×925 109 KB

Screenshot 2025-05-02 at 18.39.25
Screenshot 2025-05-02 at 18.39.252834×1233 239 KB

Screenshot 2025-05-02 at 18.40.26
Screenshot 2025-05-02 at 18.40.262242×1111 295 KB

Information on your n8n setup

  • n8n version: → 1.90 latest stable
  • Database (default: SQLite): -->no/default
  • Running n8n via (Docker, npm, n8n cloud, desktop app): → cloud
2

@Enrico_Terzi I think you call it right, this Error Message doesn’t tell much…

“Window buffer memory” is a good Concept Name but not descriptive…

I’d like to reproduce it, would you mind pasting the code (using ```)?