Index: branches/lighttpd-1.4.x/src/mod_fastcgi.c
===================================================================
--- branches/lighttpd-1.4.x/src/mod_fastcgi.c	(revision 1537)
+++ branches/lighttpd-1.4.x/src/mod_fastcgi.c	(working copy)
@@ -2502,6 +2502,8 @@
 			}
 			break;
 		case FCGI_STDERR:
+			if (packet.len == 0) break;
+
 			log_error_write(srv, __FILE__, __LINE__, "sb",
 					"FastCGI-stderr:", packet.b);