diff --git a/src/slic3r/GUI/ProgressStatusBar.cpp b/src/slic3r/GUI/ProgressStatusBar.cpp
index 2f1937623..b48c5732b 100644
--- a/src/slic3r/GUI/ProgressStatusBar.cpp
+++ b/src/slic3r/GUI/ProgressStatusBar.cpp
@@ -67,16 +67,18 @@ ProgressStatusBar::ProgressStatusBar(wxWindow *parent, int id):
 }
 
 ProgressStatusBar::~ProgressStatusBar() {
-    if(m_timer->IsRunning()) m_timer->Stop();
+    if(m_timer && m_timer->IsRunning()) m_timer->Stop();
 }
 
 int ProgressStatusBar::get_progress() const
 {
-    return m_prog->GetValue();
+    return m_prog ? m_prog->GetValue() : 0;
 }
 
 void ProgressStatusBar::set_progress(int val)
 {
+    if(!m_prog) return;
+    
     if(!m_prog->IsShown()) show_progress(true);
     if(val < 0) return;
 
@@ -91,24 +93,28 @@ void ProgressStatusBar::set_progress(int val)
 
 int ProgressStatusBar::get_range() const
 {
-    return m_prog->GetRange();
+    return m_prog ? m_prog->GetRange() : 0;
 }
 
 void ProgressStatusBar::set_range(int val)
 {
-    if(val != m_prog->GetRange()) {
+    if(m_prog && val != m_prog->GetRange()) {
         m_prog->SetRange(val);
     }
 }
 
 void ProgressStatusBar::show_progress(bool show)
 {
-    m_prog->Show(show);
-    m_prog->Pulse();
+    if(m_prog) {
+        m_prog->Show(show);
+        m_prog->Pulse();
+    }
 }
 
 void ProgressStatusBar::start_busy(int rate)
 {
+    if(!m_prog) return;
+    
     m_busy = true;
     show_progress(true);
     if (!m_timer->IsRunning()) {
@@ -118,6 +124,8 @@ void ProgressStatusBar::start_busy(int rate)
 
 void ProgressStatusBar::stop_busy()
 {
+    if(!m_timer || !m_prog) return;
+    
     m_timer->Stop();
     show_progress(false);
     m_prog->SetValue(0);
@@ -126,13 +134,15 @@ void ProgressStatusBar::stop_busy()
 
 void ProgressStatusBar::set_cancel_callback(ProgressStatusBar::CancelFn ccb) {
     m_cancel_cb = ccb;
-    if(ccb) m_cancelbutton->Show();
-    else m_cancelbutton->Hide();
+    if(m_cancelbutton) {
+        if(ccb) m_cancelbutton->Show();
+        else m_cancelbutton->Hide();
+    }
 }
 
 void ProgressStatusBar::run(int rate)
 {
-    if(!m_timer->IsRunning()) {
+    if(m_timer && !m_timer->IsRunning()) {
         m_timer->Start(rate);
     }
 }
@@ -140,12 +150,12 @@ void ProgressStatusBar::run(int rate)
 void ProgressStatusBar::embed(wxFrame *frame)
 {
     wxFrame* mf = frame ? frame : GUI::wxGetApp().mainframe;
-    mf->SetStatusBar(self);
+    if(mf) mf->SetStatusBar(self);
 }
 
 void ProgressStatusBar::set_status_text(const wxString& txt)
 {
-	self->SetStatusText(txt);
+	if(self) self->SetStatusText(txt);
 }
 
 void ProgressStatusBar::set_status_text(const std::string& txt)
@@ -160,12 +170,12 @@ void ProgressStatusBar::set_status_text(const char *txt)
 
 void ProgressStatusBar::show_cancel_button()
 {
-    m_cancelbutton->Show();
+    if(m_cancelbutton) m_cancelbutton->Show();
 }
 
 void ProgressStatusBar::hide_cancel_button()
 {
-    m_cancelbutton->Hide();
+    if(m_cancelbutton) m_cancelbutton->Hide();
 }
 
 }