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;