diff --git a/src/trace.cpp b/src/trace.cpp
index 86e718e..814484b 100644
--- a/src/trace.cpp
+++ b/src/trace.cpp
@@ -270,9 +270,11 @@ void trace_poll()
                         log = F("{\"type\":\"trace\",\"data\":[");
                         trace_dumpJSON(log);
                         log.concat(F("]}"));
-                        _wss->textAll(log);
+                        if (_wss->availableForWriteAll())
+                            _wss->textAll(log);
                     } else
-                        _wss->textAll(F("{\"type\":\"trace\",\"text\":\"Memory error\"}"));
+                        if (_wss->availableForWriteAll())
+                            _wss->textAll(F("{\"type\":\"trace\",\"text\":\"Memory error\"}"));
                 }
             } else
                 _modified = 0; // zadny pripojeny klient - po pripojeni stejne musime vyzadat stav, takze ted muzeme modifikaci klidne ignorovat