diff --git a/src/generic/graphicc.cpp b/src/generic/graphicc.cpp
index f40b1c5845..2b2c0671f5 100644
--- a/src/generic/graphicc.cpp
+++ b/src/generic/graphicc.cpp
@@ -1253,7 +1253,9 @@ void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDou
 
 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
 {
-    if ( m_font.IsNull() || str.empty())
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxCairoContext::DrawText - no valid font set") );
+
+    if ( str.empty())
         return;
     
     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
@@ -1271,7 +1273,9 @@ void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
                                     wxDouble *descent, wxDouble *externalLeading ) const
 {
-    if ( m_font.IsNull() || str.empty())
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxCairoContext::GetTextExtent - no valid font set") );
+
+    if ( str.empty())
         return;
 
     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
@@ -1303,6 +1307,8 @@ void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble&
     widths.Empty();
     widths.Add(0, text.length());
 
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxCairoContext::GetPartialTextExtents - no valid font set") );
+
     if (text.empty())
         return;
 
diff --git a/src/mac/carbon/graphics.cpp b/src/mac/carbon/graphics.cpp
index 9257e7fc31..74b2173952 100755
--- a/src/mac/carbon/graphics.cpp
+++ b/src/mac/carbon/graphics.cpp
@@ -1758,8 +1758,7 @@ void wxMacCoreGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDoub
 
 void wxMacCoreGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle )
 {
-    if ( m_font.IsNull() )
-        return;
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxMacCoreGraphicsContext::DrawText - no valid font set") );
 
     EnsureIsValid();
 
@@ -1873,7 +1872,7 @@ void wxMacCoreGraphicsContext::DrawText( const wxString &str, wxDouble x, wxDoub
 void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
                             wxDouble *descent, wxDouble *externalLeading ) const
 {
-    wxCHECK_RET( !m_font.IsNull(), wxT("wxDC(cg)::DoGetTextExtent - no valid font set") );
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxMacCoreGraphicsContext::GetTextExtent - no valid font set") );
 
     if ( width )
         *width = 0;
@@ -1951,6 +1950,8 @@ void wxMacCoreGraphicsContext::GetPartialTextExtents(const wxString& text, wxArr
     widths.Empty();
     widths.Add(0, text.length());
 
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxMacCoreGraphicsContext::GetPartialTextExtents - no valid font set") );
+
     if (text.empty())
         return;
 
diff --git a/src/msw/graphics.cpp b/src/msw/graphics.cpp
index e5583f4dcb..a271a0998b 100644
--- a/src/msw/graphics.cpp
+++ b/src/msw/graphics.cpp
@@ -1214,7 +1214,9 @@ void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxD
 
 void wxGDIPlusContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
 {
-    if ( m_font.IsNull() || str.IsEmpty())
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxGDIPlusContext::DrawText - no valid font set") );
+
+    if ( str.IsEmpty())
         return ;
 
     wxWCharBuffer s = str.wc_str( *wxConvUI );
@@ -1225,6 +1227,8 @@ void wxGDIPlusContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
 void wxGDIPlusContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
                                      wxDouble *descent, wxDouble *externalLeading ) const
 {
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxGDIPlusContext::GetTextExtent - no valid font set") );
+
     wxWCharBuffer s = str.wc_str( *wxConvUI );
     FontFamily ffamily ;
     Font* f = ((wxGDIPlusFontData*)m_font.GetRefData())->GetGDIPlusFont();
@@ -1270,6 +1274,8 @@ void wxGDIPlusContext::GetPartialTextExtents(const wxString& text, wxArrayDouble
     widths.Empty();
     widths.Add(0, text.length());
 
+    wxCHECK_RET( !m_font.IsNull(), wxT("wxGDIPlusContext::GetPartialTextExtents - no valid font set") );
+
     if (text.empty())
         return;