diff --git a/ext/session/mod_mm.c b/ext/session/mod_mm.c
index 962e19666a2a3..76de6035a315c 100644
--- a/ext/session/mod_mm.c
+++ b/ext/session/mod_mm.c
@@ -264,7 +264,7 @@ static void ps_mm_destroy(ps_mm *data)
 
 PHP_MINIT_FUNCTION(ps_mm)
 {
-	size_t save_path_len = strlen(PS(save_path));
+	size_t save_path_len = ZSTR_LEN(PS(save_path));
 	size_t mod_name_len = strlen(sapi_module.name);
 	size_t euid_len;
 	char *ps_mm_path, euid[30];
@@ -284,8 +284,8 @@ PHP_MINIT_FUNCTION(ps_mm)
 	/* Directory + '/' + File + Module Name + Effective UID + \0 */
 	ps_mm_path = emalloc(save_path_len + 1 + (sizeof(PS_MM_FILE) - 1) + mod_name_len + euid_len + 1);
 
-	memcpy(ps_mm_path, PS(save_path), save_path_len);
-	if (save_path_len && PS(save_path)[save_path_len - 1] != DEFAULT_SLASH) {
+	memcpy(ps_mm_path, ZSTR_VAL(PS(save_path)), save_path_len);
+	if (save_path_len && ZSTR_VAL(PS(save_path))[save_path_len - 1] != DEFAULT_SLASH) {
 		ps_mm_path[save_path_len] = DEFAULT_SLASH;
 		save_path_len++;
 	}
diff --git a/ext/uri/tests/whatwg/getters/gh20771.phpt b/ext/uri/tests/whatwg/getters/gh20771.phpt
new file mode 100644
index 0000000000000..19f1d1fb0f500
--- /dev/null
+++ b/ext/uri/tests/whatwg/getters/gh20771.phpt
@@ -0,0 +1,14 @@
+--TEST--
+GH-20771 (Assertion failure when getUnicodeHost() returns empty string)
+--EXTENSIONS--
+uri
+--FILE--
+<?php
+
+$url = Uri\WhatWg\Url::parse('test://');
+
+var_dump($url->getUnicodeHost());
+
+?>
+--EXPECT--
+string(0) ""
diff --git a/ext/uri/uri_parser_whatwg.c b/ext/uri/uri_parser_whatwg.c
index 2e9ffad22d463..055f130af7c65 100644
--- a/ext/uri/uri_parser_whatwg.c
+++ b/ext/uri/uri_parser_whatwg.c
@@ -365,7 +365,7 @@ static zend_result php_uri_parser_whatwg_host_read(void *uri, php_uri_component_
 				lxb_url_serialize_host_unicode(&lexbor_idna, &lexbor_uri->host, serialize_to_smart_str_callback, &host_str);
 				lxb_unicode_idna_clean(&lexbor_idna);
 
-				ZVAL_NEW_STR(retval, smart_str_extract(&host_str));
+				ZVAL_STR(retval, smart_str_extract(&host_str));
 				break;
 			}
 			case PHP_URI_COMPONENT_READ_MODE_NORMALIZED_ASCII: