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diff --git a/modules/cache/cache_util.c b/modules/cache/cache_util.c
index 7b7fb45..fbebb1e 100644
--- a/modules/cache/cache_util.c
+++ b/modules/cache/cache_util.c
@@ -1251,8 +1251,10 @@ CACHE_DECLARE(apr_table_t *)ap_cache_cacheable_headers_out(request_rec *r)
if (!apr_table_get(headers_out, "Content-Type")
&& r->content_type) {
- apr_table_setn(headers_out, "Content-Type",
- ap_make_content_type(r, r->content_type));
+ const char *ctype = ap_make_content_type(r, r->content_type);
+ if (ctype) {
+ apr_table_setn(headers_out, "Content-Type", ctype);
+ }
}
if (!apr_table_get(headers_out, "Content-Encoding")