diff -urN hal-0.4.2/tools/fstab-sync.c hal-0.4.2.new/tools/fstab-sync.c
--- hal-0.4.2/tools/fstab-sync.c	2004-10-21 22:27:44.000000000 +0100
+++ hal-0.4.2.new/tools/fstab-sync.c	2005-10-06 13:05:45.072898583 +0100
@@ -1008,6 +1008,9 @@
 {
   FSTableLine *line, *previous_line; 
 
+  if (block_device == NULL)
+      return NULL;
+
   previous_line = NULL;
   line = table->lines;
   while (line != NULL)