diff --git a/platform/backend/app/api/tasks.py b/platform/backend/app/api/tasks.py
index 2515a74..26ed53f 100644
--- a/platform/backend/app/api/tasks.py
+++ b/platform/backend/app/api/tasks.py
@@ -267,17 +267,12 @@ def get_module_detail(module_id: str, db: Session = Depends(get_db), current_use
                 outputs["采集日期"] = data.get("date", "")
                 outputs["更新时间"] = data.get("updated_at", "")
                 outputs["热点总数"] = len(trends)
-                by_source = {}
-                for t in trends:
-                    s = t.get("source", "unknown")
-                    by_source.setdefault({"weibo":"微博","zhihu":"知乎","baidu":"百度","llm":"LLM"}.get(s, s), 0)
-                    by_source[[k for k,v in {"weibo":"微博","zhihu":"知乎","baidu":"百度","llm":"LLM"}.items() if v==s or k==s][0] if s in ("weibo","zhihu","baidu","llm") else s] += 1
-                # count by source properly
                 by_source_clean = {}
                 for t in trends:
                     s = t.get("source", "")
                     label = {"weibo":"微博","zhihu":"知乎","baidu":"百度","llm":"LLM生成"}.get(s, s)
-                    by_source_clean[label] = by_source_clean.get(label, 0) + 1
+                    if label:
+                        by_source_clean[label] = by_source_clean.get(label, 0) + 1
                 outputs["来源分布"] = by_source_clean
                 outputs["热点列表"] = [{"topic": t.get("topic",""), "domain": t.get("domain",""), "platform": t.get("platform",""), "source": {"weibo":"微博","zhihu":"知乎","baidu":"百度","llm":"LLM"}.get(t.get("source",""),"")} for t in trends[:20]]
             except Exception: