Index: mod-wsgi-3.4/mod_wsgi.c
===================================================================
--- mod-wsgi-3.4.orig/mod_wsgi.c	2015-09-08 17:59:07.000000000 +0300
+++ mod-wsgi-3.4/mod_wsgi.c	2015-09-08 18:00:28.458492411 +0300
@@ -13320,6 +13320,9 @@
     r->proto_input_filters = c->input_filters;
     r->input_filters = r->proto_input_filters;
 
+    r->trailers_in = apr_table_make(r->pool, 5);
+    r->trailers_out = apr_table_make(r->pool, 5);
+
     r->per_dir_config  = r->server->lookup_defaults;
 
     r->sent_bodyct = 0;