diff --git a/NEWS b/NEWS
index 69728b4aec6..70d667af034 100644
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,10 @@ PHP                                                                        NEWS
   . Fixed bug #72658 (Locale::lookup() / locale_lookup() hangs if no match
     found). (Anatol)
 
+- Mysqlnd:
+  . Fixed bug #71863 (Segfault when EXPLAIN with "Unknown column" error when
+    using MariaDB). (Andrey)
+
 - Reflection:
   . Fixed bug #72661 (ReflectionType::__toString crashes with iterable).
     (Laruence)
diff --git a/ext/mysqli/tests/bug71863.phpt b/ext/mysqli/tests/bug71863.phpt
new file mode 100644
index 00000000000..889792822f7
--- /dev/null
+++ b/ext/mysqli/tests/bug71863.phpt
@@ -0,0 +1,37 @@
+--TEST--
+Bug #71863 Segfault when EXPLAIN with "Unknown Column" Error
+--SKIPIF--
+<?php
+require_once('skipif.inc');
+require_once('skipifconnectfailure.inc');
+require_once("connect.inc");
+if (!$IS_MYSQLND) {
+	die("skip mysqlnd only test");
+}
+?>
+--FILE--
+<?php
+require_once("connect.inc");
+
+$req = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket);
+
+// create db and table for test
+mysqli_query($req, "DROP TABLE IF EXISTS test_bug_71863") or die(mysqli_error($req));
+mysqli_query($req, "CREATE TABLE test_bug_71863 (id INT UNSIGNED NOT NULL DEFAULT 0)") or die(mysqli_error($req));
+    
+// segfault if EXPLAIN + "Unknown column" error
+mysqli_query($req, "EXPLAIN SELECT `id` FROM `test_bug_71863` WHERE `owner_id` = '2' AND `object_id` = '1' AND type = '0'") or die(mysqli_error($req)."\n");
+
+?>
+--CLEAN--
+<?php
+require_once("connect.inc");
+if (!$link = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket))
+    printf("[c001] [%d] %s\n", mysqli_connect_errno(), mysqli_connect_error());
+if (!mysqli_query($link, "DROP TABLE IF EXISTS test_bug_71863"))
+    printf("[c002] Cannot drop table, [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+mysqli_close($link);
+?>
+--EXPECTF--
+Warning: mysqli_query(): (42S22/1054): Unknown column 'owner_id' in 'where clause' in %sbug71863.php on line %d
+Unknown column 'owner_id' in 'where clause'
\ No newline at end of file
diff --git a/ext/mysqlnd/mysqlnd_connection.c b/ext/mysqlnd/mysqlnd_connection.c
index 701bc282e11..a3300dc6d90 100644
--- a/ext/mysqlnd/mysqlnd_connection.c
+++ b/ext/mysqlnd/mysqlnd_connection.c
@@ -215,11 +215,11 @@ MYSQLND_CLASS_METHODS_START(mysqlnd_connection_state)
 MYSQLND_CLASS_METHODS_END;
 
 
-/* {{{ mysqlnd_upsert_status_init */
+/* {{{ mysqlnd_connection_state_init */
 PHPAPI void
 mysqlnd_connection_state_init(struct st_mysqlnd_connection_state * const state)
 {
-	DBG_ENTER("mysqlnd_error_info_init");
+	DBG_ENTER("mysqlnd_connection_state_init");
 	state->m = &MYSQLND_CLASS_METHOD_TABLE_NAME(mysqlnd_connection_state);
 	state->state = CONN_ALLOCED;
 	DBG_VOID_RETURN;
diff --git a/ext/mysqlnd/mysqlnd_result.c b/ext/mysqlnd/mysqlnd_result.c
index c4aa537eb07..513214d3fa4 100644
--- a/ext/mysqlnd/mysqlnd_result.c
+++ b/ext/mysqlnd/mysqlnd_result.c
@@ -259,6 +259,8 @@ MYSQLND_METHOD(mysqlnd_result_buffered, free_result)(MYSQLND_RES_BUFFERED * cons
 	DBG_ENTER("mysqlnd_result_buffered::free_result");
 	DBG_INF_FMT("Freeing "MYSQLND_LLU_SPEC" row(s)", set->row_count);
 
+	mysqlnd_error_info_free_contents(&set->error_info);
+
 	if (set->type == MYSQLND_BUFFERED_TYPE_ZVAL) {
 		MYSQLND_METHOD(mysqlnd_result_buffered_zval, free_result)((MYSQLND_RES_BUFFERED_ZVAL *) set);
 	} if (set->type == MYSQLND_BUFFERED_TYPE_C) {
@@ -1954,7 +1956,6 @@ mysqlnd_result_unbuffered_init(const unsigned int field_count, const zend_bool p
 	if (!ret) {
 		DBG_RETURN(NULL);
 	}
-
 	if (!(ret->lengths = mnd_pecalloc(field_count, sizeof(size_t), persistent))) {
 		mnd_pefree(ret, persistent);
 		DBG_RETURN(NULL);
@@ -1995,6 +1996,10 @@ mysqlnd_result_buffered_zval_init(const unsigned int field_count, const zend_boo
 	if (!ret) {
 		DBG_RETURN(NULL);
 	}
+	if (FAIL == mysqlnd_error_info_init(&ret->error_info, persistent)) {
+		mnd_pefree(ret, persistent);
+		DBG_RETURN(NULL);
+	}
 	if (!(ret->lengths = mnd_pecalloc(field_count, sizeof(size_t), persistent))) {
 		mnd_pefree(ret, persistent);
 		DBG_RETURN(NULL);
@@ -2038,6 +2043,10 @@ mysqlnd_result_buffered_c_init(const unsigned int field_count, const zend_bool p
 	if (!ret) {
 		DBG_RETURN(NULL);
 	}
+	if (FAIL == mysqlnd_error_info_init(&ret->error_info, persistent)) {
+		mnd_pefree(ret, persistent);
+		DBG_RETURN(NULL);
+	}
 	if (!(ret->lengths = mnd_pecalloc(field_count, sizeof(size_t), persistent))) {
 		mnd_pefree(ret, persistent);
 		DBG_RETURN(NULL);