--- src/htmlparser.c~	2013-04-28 12:42:52.569907543 +0800
+++ src/htmlparser.c	2013-04-28 12:43:43.119907178 +0800
@@ -1991,7 +1991,7 @@
         p += strspn(p, "\n\r");
     }
 
-    if (hpinfo->rewrite)
+    if (hpinfo->rewrite && stackc)
     {
         ilen = strlen(stackc);
         hpinfo->stack_offset = 0;
@@ -2150,7 +2150,7 @@
         p += strspn(p, "\n\r");
     }
 
-    if (hpinfo->rewrite)
+    if (hpinfo->rewrite && stackc)
     {
         ilen = strlen(stackc);
         hpinfo->stack_offset = 0;