diff --git a/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java b/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java
index f3e84fb..59726d9 100644
--- a/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java
+++ b/src/main/java/com/knowledge/base/infrastructure/util/http/FilteredSseOutputAdapter.java
@@ -24,8 +24,8 @@ public class FilteredSseOutputAdapter implements WriterAdapter {
 
     @Override
     public void writeLine(String line) throws IOException {
-        if (StrUtil.isBlank(line)) {
-            return;
+        if (StrUtil.isBlank(line) || closed) {
+            return; // 如果已关闭，不再处理
         }
 
         if (line.startsWith("data:")) {
@@ -36,42 +36,38 @@ public class FilteredSseOutputAdapter implements WriterAdapter {
             Map<String, Object> original = mapper.readValue(line, Map.class);
             Map<String, Object> filtered = new HashMap<>();
 
-            // textResponse 累积
             if (original.containsKey("textResponse")) {
                 filtered.put("textResponse", original.get("textResponse"));
                 lastChunk.put("textResponse", original.get("textResponse"));
             }
 
-            // sources 只保存不立刻发
             if (original.containsKey("sources")) {
                 lastChunk.put("sources", original.get("sources"));
             }
 
-            // close 也缓存并判断是否最后一条
             if (original.containsKey("close")) {
                 lastChunk.put("close", original.get("close"));
             }
 
             if (Boolean.TRUE.equals(original.get("close"))) {
-                // 合并缓存数据并一次性输出
                 filtered.putAll(lastChunk);
                 lastChunk.clear();
 
                 String payload = mapper.writeValueAsString(filtered);
                 emitter.send(SseEmitter.event().data(payload));
-
-                if (!closed) {
-                    closed = true;
-                    emitter.complete();
-                }
+                closed = true;
+                emitter.complete();
             } else if (!filtered.isEmpty()) {
-                // 中间段
                 String payload = mapper.writeValueAsString(filtered);
                 emitter.send(SseEmitter.event().data(payload));
             }
 
+        } catch (IllegalStateException e) {
+            log.warn("SSE连接已关闭，忽略发送: {}", e.getMessage());
+            closed = true;
         } catch (Exception e) {
             log.warn("SSE数据解析失败：{}", line, e);
         }
     }
+
 }