diff --git a/rxlib/src/main/java/org/rx/core/ThreadPool.java b/rxlib/src/main/java/org/rx/core/ThreadPool.java
index 46c89cb1..c9ee5261 100644
--- a/rxlib/src/main/java/org/rx/core/ThreadPool.java
+++ b/rxlib/src/main/java/org/rx/core/ThreadPool.java
@@ -205,7 +205,7 @@ public T call() {
                 throw e;
             } finally {
                 Thread t = Thread.currentThread();
-                TraceHandler.INSTANCE.saveMethodTrace(t, fn.getClass(), Reflects.getStackTrace(t), new Object[]{id},
+                TraceHandler.INSTANCE.saveMethodTrace(t, fn.getClass(), Reflects.getStackTrace(t), id == null ? null : new Object[]{id},
                         r, ex, System.nanoTime() - s);
             }
             return r;
diff --git a/rxlib/src/main/java/org/rx/exception/TraceHandler.java b/rxlib/src/main/java/org/rx/exception/TraceHandler.java
index ab7c16c0..46076b68 100644
--- a/rxlib/src/main/java/org/rx/exception/TraceHandler.java
+++ b/rxlib/src/main/java/org/rx/exception/TraceHandler.java
@@ -28,6 +28,7 @@
 import java.util.concurrent.ScheduledFuture;
 
 import static org.rx.core.Extends.as;
+import static org.rx.core.Extends.ifNull;
 import static org.rx.core.RxConfig.ConfigNames.TRACE_KEEP_DAYS;
 import static org.rx.core.RxConfig.ConfigNames.getWithoutPrefix;
 import static org.rx.core.Sys.toJsonString;
@@ -195,7 +196,7 @@ void innerSave(String thread, String msg, Throwable e) {
         int eMsgFlag = stackTrace.indexOf("\n");
         String eMsg = stackTrace.substring(0, eMsgFlag);
         stackTrace = stackTrace.substring(eMsgFlag + 2);
-        msg = eMsg + msg;
+        msg = eMsg + ifNull(msg, "");
 
         long pk = CodecUtil.hash64(stackTrace);
 //        Tasks.nextPool().runSerial(() -> {