--- rxvt-unicode/src/rxvtfont.C	2005/02/11 05:51:14	1.66
+++ rxvt-unicode/src/rxvtfont.C	2005/02/12 18:55:04	1.67
@@ -1383,7 +1383,8 @@
 
       do
         {
-          while (*desc <= ' ') desc++;
+          while (*desc && *desc <= ' ')
+            desc++;
 
           codeset cs = CS_UNICODE;