diff --git a/api/db/services/dialog_service.py b/api/db/services/dialog_service.py
index e8e7f6d01d..5dacc32bb2 100644
--- a/api/db/services/dialog_service.py
+++ b/api/db/services/dialog_service.py
@@ -554,9 +554,13 @@ async def async_chat(dialog, messages, stream=True, **kwargs):
             logging.debug("SQL failed or returned no results, falling back to vector search")
 
     param_keys = [p["key"] for p in prompt_config.get("parameters", [])]
+    if dialog.kb_ids and "knowledge" not in param_keys and "{knowledge}" in prompt_config.get("system", ""):
+        logging.warning("prompt_config['parameters'] is missing 'knowledge' entry despite kb_ids being set; auto-fixing.")
+        prompt_config.setdefault("parameters", []).append({"key": "knowledge", "optional": False})
+        param_keys.append("knowledge")
     logging.debug(f"attachments={attachments}, param_keys={param_keys}, embd_mdl={embd_mdl}")
 
-    for p in prompt_config["parameters"]:
+    for p in prompt_config.get("parameters", []):
         if p["key"] == "knowledge":
             continue
         if p["key"] not in kwargs and not p["optional"]: