1 files changed, 3 insertions, 1 deletions

diff --git a/lib/sitecing_interface_cgi.cc b/lib/sitecing_interface_cgi.cc
index 59ae25a..1acb23c 100644
--- a/lib/sitecing_interface_cgi.cc
+++ b/lib/sitecing_interface_cgi.cc
@@ -1,48 +1,50 @@
 #include <cassert>
 #include "sitecing/sitecing_interface_cgi.h"
 
 namespace sitecing {
 
     sitecing_interface_cgi::sitecing_interface_cgi(sitespace *s)
         : outs(&prebuffer), sitecing_interface(&outs), ss(s), cgigw(NULL), headers_flushed(false) {
         }
 
     void sitecing_interface_cgi::prepare(kingate::cgi_gateway *cg) {
         cgigw = cg;
         headers.clear();
         headers["Content-Type"] = "text/html";
         prebuffer.str("");
         headers_flushed = false;
         set_buffering(true);
     }
 
     void sitecing_interface_cgi::flush(bool keep_buffering) {
         assert(cgigw);
         flush_headers();
         if(is_buffering()) {
             streampos count = prebuffer.pubseekoff(0,ios_base::cur,ios_base::out);
-            cgigw->out().write(prebuffer.str().c_str(),count);
+            if(count>0) {
+                cgigw->out().write(prebuffer.str().c_str(),count);
+            }
             prebuffer.str("");
         }
         cgigw->out().flush();
         set_buffering(keep_buffering);
     }
 
     void sitecing_interface_cgi::set_buffering(bool do_buffer) {
         if(!do_buffer)
             flush_headers();
         outs.rdbuf(do_buffer?&prebuffer:cgigw->out().rdbuf());
     }
 
     bool sitecing_interface_cgi::is_buffering() {
         return outs.rdbuf()==&prebuffer;
     }
 
     void sitecing_interface_cgi::flush_headers() {
         assert(cgigw);
         if(headers_flushed)
             return;
         for(kingate::headers::const_iterator i=headers.begin();i!=headers.end();i++)
             cgigw->out() << i->first << ": " << i->second << "\n";
         cgigw->out() << "\n";
         headers_flushed = true;