diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 5d20d5fea..d8e824a85 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -317,6 +317,8 @@ void BackgroundSlicingProcess::thread_proc()
 			break;
 		// Process the background slicing task.
 		m_state = STATE_RUNNING;
+		//BBS: internal cancel
+		m_internal_cancelled = false;
 		lck.unlock();
 		std::exception_ptr exception;
 #ifdef _WIN32
@@ -337,6 +339,10 @@ void BackgroundSlicingProcess::thread_proc()
 			BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(": send SlicingProcessCompletedEvent to main, status %1%")%evt.status();
 			wxQueueEvent(GUI::wxGetApp().mainframe->m_plater, evt.Clone());
 		}
+		else {
+			//BBS: internal cancel
+			m_internal_cancelled = true;
+		}
 		m_print->restart();
 		lck.unlock();
 		// Let the UI thread wake up if it is waiting for the background task to finish.
diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.hpp b/src/slic3r/GUI/BackgroundSlicingProcess.hpp
index 3222aece7..7d3ae2397 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.hpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.hpp
@@ -184,6 +184,7 @@ public:
     //BBS: improve the finished logic, also judge the m_gcode_result
     //bool    finished() const { return m_print->finished(); }
     bool    finished() const { return m_print->finished() && !m_gcode_result->moves.empty(); }
+    bool    is_internal_cancelled() { return m_internal_cancelled; }
 
     //BBS: add Plater to friend class
     //need to call stop_internal in ui thread
@@ -274,6 +275,7 @@ private:
 	//BBS: partplate related
 	GUI::PartPlate* m_current_plate;
 	PrinterTechnology m_printer_tech = ptUnknown;
+	bool m_internal_cancelled = false;
 
     PrintState<BackgroundSlicingProcessStep, bspsCount>   	m_step_state;
 	bool                set_step_started(BackgroundSlicingProcessStep step);
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 3b39d2ccf..3b984eb34 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -4536,14 +4536,18 @@ unsigned int Plater::priv::update_background_process(bool force_validation, bool
         process_completed_with_error = -1;
     }
 
-    if (invalidated != Print::APPLY_STATUS_UNCHANGED && was_running && ! this->background_process.running() &&
-        (return_state & UPDATE_BACKGROUND_PROCESS_RESTART) == 0) {
-        // The background processing was killed and it will not be restarted.
-        // Post the "canceled" callback message, so that it will be processed after any possible pending status bar update messages.
-        SlicingProcessCompletedEvent evt(EVT_PROCESS_COMPLETED, 0,
-            SlicingProcessCompletedEvent::Cancelled, nullptr);
-        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(" %1%, post an EVT_PROCESS_COMPLETED to main, status %2%")%__LINE__ %evt.status();
-        wxQueueEvent(q, evt.Clone());
+    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(", Line %1%: was_running = %2%, running %3%, invalidated=%4%, return_state=%5%, internal_cancel=%6%")
+        % __LINE__ % was_running % this->background_process.running() % invalidated % return_state % this->background_process.is_internal_cancelled();
+    if (was_running && ! this->background_process.running() && (return_state & UPDATE_BACKGROUND_PROCESS_RESTART) == 0) {
+        if (invalidated != Print::APPLY_STATUS_UNCHANGED || this->background_process.is_internal_cancelled())
+        {
+            // The background processing was killed and it will not be restarted.
+            // Post the "canceled" callback message, so that it will be processed after any possible pending status bar update messages.
+            SlicingProcessCompletedEvent evt(EVT_PROCESS_COMPLETED, 0,
+                SlicingProcessCompletedEvent::Cancelled, nullptr);
+            BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(" %1%, post an EVT_PROCESS_COMPLETED to main, status %2%")%__LINE__ %evt.status();
+            wxQueueEvent(q, evt.Clone());
+        }
     }
 
     if ((return_state & UPDATE_BACKGROUND_PROCESS_INVALID) != 0)