diff --exclude CVS --exclude .git -uNr fltk-2.0.x/src/x11/Font_xlfd.cxx fltk-2.0.x.modified/src/x11/Font_xlfd.cxx
--- fltk-2.0.x/src/x11/Font_xlfd.cxx	2007-10-17 17:46:35.000000000 -0200
+++ fltk-2.0.x.modified/src/x11/Font_xlfd.cxx	2009-07-13 15:44:17.000000000 -0300
@@ -536,10 +536,12 @@
   unsigned size = unsigned(psize);
 
   // See if the current font is correct:
+  if(f && f->encoding && encoding_) {
   if (font == current_font_ && psize == current_size_ &&
       (f->encoding==encoding_ ||
 	   (!encoding_ || !strcmp(f->encoding, encoding_))))
     return;
+  }
   current_font_ = font; current_size_ = psize;
 
   // search the FontSize we have generated already: