diff -r de53cada1423 -r f1bb821008fc stringstore.c
--- a/stringstore.c	Thu Jan 25 20:15:55 2007 +0100
+++ b/stringstore.c	Sat Jan 27 00:28:27 2007 +0100
@@ -21,7 +21,9 @@
 
 const char *stringstore_get(StringId id)
 {
-    return (const char*)(((Rb_node)id)->k.key);
+    return (id==STRINGID_NONE
+            ? NULL
+            : (const char*)(((Rb_node)id)->k.key));
 }