diff -urp libmetalink-0.1.3.orig/lib/metalink_pstate.c libmetalink-0.1.3/lib/metalink_pstate.c

--- libmetalink-0.1.3.orig/lib/metalink_pstate.c	2012-08-12 04:43:53.000000000 -0400

+++ libmetalink-0.1.3/lib/metalink_pstate.c	2020-07-22 17:03:21.205852103 -0400

@@ -100,7 +100,7 @@ void initial_state_start_fun(metalink_ps

 			     const char** attrs)

 {

   if(strcmp("metalink", name) == 0) {

-    if (strcmp(METALINK_V3_NS_URI, ns_uri) == 0) {

+    if (ns_uri && strcmp(METALINK_V3_NS_URI, ns_uri) == 0) {

       const char* type;

       const char* origin;

       metalink_pctrl_set_version(stm->ctrl, METALINK_VERSION_3);

@@ -116,7 +116,7 @@ void initial_state_start_fun(metalink_ps

       metalink_pstm_enter_metalink_state(stm);

     }

-    else if (strcmp(METALINK_V4_NS_URI, ns_uri) == 0) {

+    else if (ns_uri && strcmp(METALINK_V4_NS_URI, ns_uri) == 0) {

       metalink_pctrl_set_version(stm->ctrl, METALINK_VERSION_4);

       metalink_pstm_enter_metalink_state_v4(stm);

     } else {