nginx 0.7.52 *) Feature: the first native Windows binary release. *) Bugfix: in processing HEAD method while caching. *) Bugfix: in processing the "If-Modified-Since", "If-Range", etc. client request header lines while caching. *) Bugfix: now the "Set-Cookie" and "P3P" header lines are hidden in cacheable responses. *) Bugfix: if nginx was built with the ngx_http_perl_module and with a perl which supports threads, then during a master process exit the message "panic: MUTEX_LOCK" might be issued. *) Bugfix: nginx could not be built --without-http-cache; the bug had appeared in 0.7.48. *) Bugfix: nginx could not be built on platforms different from i386, amd64, sparc, and ppc; the bug had appeared in 0.7.42.

--- a/src/http/ngx_http_config.h
+++ b/src/http/ngx_http_config.h
@@ -69,8 +69,10 @@ typedef struct {
     ((ngx_http_conf_ctx_t *) cf->ctx)->loc_conf[module.ctx_index]
 
 #define ngx_http_cycle_get_module_main_conf(cycle, module)                    \
-    ((ngx_http_conf_ctx_t *)                                                  \
-         cycle->conf_ctx[ngx_http_module.index])->main_conf[module.ctx_index]
+    (cycle->conf_ctx[ngx_http_module.index] ?                                 \
+        ((ngx_http_conf_ctx_t *) cycle->conf_ctx[ngx_http_module.index])      \
+            ->main_conf[module.ctx_index]:                                    \
+        NULL)
 
 
 #endif /* _NGX_HTTP_CONFIG_H_INCLUDED_ */