diff --git a/utils/llm_client.py b/utils/llm_client.py
index f6b2b2a..2bac7a9 100644
--- a/utils/llm_client.py
+++ b/utils/llm_client.py
@@ -514,7 +514,9 @@ class LLMClient:
     @staticmethod
     def _validate_conversation_result(result: dict) -> dict:
         """Validate and normalize conversation analysis result."""
-        findings = result.get("user_findings", [])
+        if not isinstance(result, dict):
+            return {"user_findings": [], "conversation_summary": ""}
+        findings = [f for f in result.get("user_findings", []) if isinstance(f, dict)]
         for finding in findings:
             finding.setdefault("username", "unknown")
             score = float(finding.get("toxicity_score", 0.0))