diff --git a/DSView/pv/sigsession.cpp b/DSView/pv/sigsession.cpp
index 3bf1b732..b9bc6489 100644
--- a/DSView/pv/sigsession.cpp
+++ b/DSView/pv/sigsession.cpp
@@ -97,6 +97,7 @@ namespace pv
         _view_data = NULL;
         _capture_data = NULL;
         _is_stream_mode = false;
+        _is_action = false;
 
         _data_list.push_back(new SessionData());
         _data_list.push_back(new SessionData());
@@ -443,6 +444,14 @@ namespace pv
     }
 
     bool SigSession::start_capture(bool instant)
+    {
+        _is_action = true;
+        int ret = action_start_capture(instant);
+        _is_action = false;
+        return ret;
+    }
+
+    bool SigSession::action_start_capture(bool instant)
     {
         assert(_callback);
 
@@ -644,6 +653,14 @@ namespace pv
     }
 
     bool SigSession::stop_capture()
+    {
+        _is_action = true;
+        int ret = action_stop_capture();
+        _is_action = false;
+        return ret;
+    }
+
+    bool SigSession::action_stop_capture()
     { 
         if (!_is_working)
             return false;
diff --git a/DSView/pv/sigsession.h b/DSView/pv/sigsession.h
index db3d6882..e491ac06 100644
--- a/DSView/pv/sigsession.h
+++ b/DSView/pv/sigsession.h
@@ -413,6 +413,10 @@ public:
     void init_signals();
     void delay_prop_msg(QString strMsg);
 
+    inline bool is_doing_action(){
+        return _is_action;
+    }
+
 private:
     void set_cur_samplelimits(uint64_t samplelimits);
     void set_cur_snap_samplerate(uint64_t samplerate);
@@ -447,10 +451,12 @@ private:
 
     void capture_init(); 
     void nodata_timeout();
-    void feed_timeout();   
-    
+    void feed_timeout();    
     void clear_decode_result();
     void attach_data_to_signal(SessionData *data);
+
+    bool action_start_capture(bool instant);
+    bool action_stop_capture();
   
     //IMessageListener
     void OnMessage(int msg);
@@ -549,6 +555,7 @@ private:
     COLLECT_OPT_MODE    _opt_mode;
     bool        _is_stream_mode;
     QString     _strMsg;
+    bool        _is_action;
  
 
     ISessionCallback *_callback;
diff --git a/DSView/pv/toolbars/samplingbar.cpp b/DSView/pv/toolbars/samplingbar.cpp
index 508ab1ae..38ecf79c 100644
--- a/DSView/pv/toolbars/samplingbar.cpp
+++ b/DSView/pv/toolbars/samplingbar.cpp
@@ -857,6 +857,11 @@ namespace pv
         // start or stop capture
         void SamplingBar::on_run_stop()
         {
+            if (_session->is_doing_action()){
+                dsv_info("Task is busy.");
+                return;
+            }
+
             if (_session->is_working())
             {   
                 _run_stop_action->setEnabled(false);
@@ -921,6 +926,11 @@ namespace pv
                 return;
             }
 
+            if (_session->is_doing_action()){
+                dsv_info("Task is busy.");
+                return;
+            }
+
             if (_session->is_working())
             {
                 _instant_action->setEnabled(false);