diff --git a/inc/hgl/io/event/MouseEvent.h b/inc/hgl/io/event/MouseEvent.h
index 8cd00c6..25cb2de 100644
--- a/inc/hgl/io/event/MouseEvent.h
+++ b/inc/hgl/io/event/MouseEvent.h
@@ -56,6 +56,8 @@ namespace hgl
 
             MouseEvent():InputEvent(InputEventSource::Mouse)
             {
+                med=nullptr;
+                x=y=0;
                 hgl_zero(pressed_statues);
             }
             virtual ~MouseEvent()=default;
diff --git a/inc/hgl/thread/RingBuffer.h b/inc/hgl/thread/RingBuffer.h
index d1309b6..1cd8927 100644
--- a/inc/hgl/thread/RingBuffer.h
+++ b/inc/hgl/thread/RingBuffer.h
@@ -309,6 +309,8 @@ namespace hgl
         RingBufferSafeWrite(io::RingOutputStream *ros)
         {
             rb=ros->GetRingBuffer();
+
+            size=-1;
         }
 
         int Start()
diff --git a/inc/hgl/type/Map.cpp b/inc/hgl/type/Map.cpp
index 981defc..9ce953a 100644
--- a/inc/hgl/type/Map.cpp
+++ b/inc/hgl/type/Map.cpp
@@ -194,6 +194,7 @@ namespace hgl
 
         KVData *obj=GetListObject(data_list,index);
 
+        if(!obj)return(nullptr);
         return &(obj->value);
     }