diff --git a/src/common/dcgraph.cpp b/src/common/dcgraph.cpp
index 481f256d2a..df722ea5d9 100644
--- a/src/common/dcgraph.cpp
+++ b/src/common/dcgraph.cpp
@@ -451,7 +451,7 @@ void wxGCDCImpl::SetFont( const wxFont &font )
             f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
         m_graphicContext->SetFont( f, m_textForegroundColour );
 #if defined(__WXGTK__) || defined(__WXOSX__)
-        if ( m_font.GetNoAntiAliasing() ) 
+        if ( m_font.IsOk() && m_font.GetNoAntiAliasing() ) 
         {
             m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
         }