diff --git a/lib/nghttp2_session.c b/lib/nghttp2_session.c
index a9829048..780ad5f1 100644
--- a/lib/nghttp2_session.c
+++ b/lib/nghttp2_session.c
@@ -2556,6 +2556,8 @@ static int session_after_frame_sent2(nghttp2_session *session) {
   nghttp2_bufs *framebufs = &aob->framebufs;
   nghttp2_frame *frame;
   nghttp2_mem *mem;
+  nghttp2_stream *stream;
+  nghttp2_data_aux_data *aux_data;
 
   mem = &session->mem;
   frame = &item->frame;
@@ -2578,50 +2580,46 @@ static int session_after_frame_sent2(nghttp2_session *session) {
     active_outbound_item_reset(&session->aob, mem);
 
     return 0;
-  } else {
-    nghttp2_stream *stream;
-    nghttp2_data_aux_data *aux_data;
+  }
 
-    aux_data = &item->aux_data.data;
+  /* DATA frame */
 
-    /* On EOF, we have already detached data.  Please note that
-       application may issue nghttp2_submit_data() in
-       on_frame_send_callback (call from session_after_frame_sent1),
-       which attach data to stream.  We don't want to detach it. */
-    if (aux_data->eof) {
-      active_outbound_item_reset(aob, mem);
+  aux_data = &item->aux_data.data;
 
-      return 0;
-    }
-
-    /* Reset no_copy here because next write may not use this. */
-    aux_data->no_copy = 0;
-
-    stream = nghttp2_session_get_stream(session, frame->hd.stream_id);
-
-    /* If session is closed or RST_STREAM was queued, we won't send
-       further data. */
-    if (nghttp2_session_predicate_data_send(session, stream) != 0) {
-      if (stream) {
-        rv = nghttp2_stream_detach_item(stream);
-
-        if (nghttp2_is_fatal(rv)) {
-          return rv;
-        }
-      }
-
-      active_outbound_item_reset(aob, mem);
-
-      return 0;
-    }
-
-    aob->item = NULL;
-    active_outbound_item_reset(&session->aob, mem);
+  /* On EOF, we have already detached data.  Please note that
+     application may issue nghttp2_submit_data() in
+     on_frame_send_callback (call from session_after_frame_sent1),
+     which attach data to stream.  We don't want to detach it. */
+  if (aux_data->eof) {
+    active_outbound_item_reset(aob, mem);
 
     return 0;
   }
-  /* Unreachable */
-  assert(0);
+
+  /* Reset no_copy here because next write may not use this. */
+  aux_data->no_copy = 0;
+
+  stream = nghttp2_session_get_stream(session, frame->hd.stream_id);
+
+  /* If session is closed or RST_STREAM was queued, we won't send
+     further data. */
+  if (nghttp2_session_predicate_data_send(session, stream) != 0) {
+    if (stream) {
+      rv = nghttp2_stream_detach_item(stream);
+
+      if (nghttp2_is_fatal(rv)) {
+        return rv;
+      }
+    }
+
+    active_outbound_item_reset(aob, mem);
+
+    return 0;
+  }
+
+  aob->item = NULL;
+  active_outbound_item_reset(&session->aob, mem);
+
   return 0;
 }