diff -rup groff-1.18.1.4/src/roff/troff/node.cc groff-1.18.1.4.test/src/roff/troff/node.cc
--- groff-1.18.1.4/src/roff/troff/node.cc	2010-06-28 12:11:58.511549052 +0200
+++ groff-1.18.1.4.test/src/roff/troff/node.cc	2010-06-28 17:48:57.663673790 +0200
@@ -3450,7 +3450,7 @@ int node::nbreaks()
 breakpoint *space_node::get_breakpoints(hunits width, int ns,
 					breakpoint *rest, int is_inner)
 {
-  if (next->discardable())
+  if (next && next->discardable())
     return rest;
   breakpoint *bp = new breakpoint;
   bp->next = rest;