diff --git a/NEWS b/NEWS
index d41711a82e0..533617e7995 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ PHP                                                                        NEWS
 - Core:
   . Fixed bug GH-15712: zend_strtod overflow with precision INI set on
     large value. (David Carlier)
+  . Fixed bug GH-15905 (Assertion failure for TRACK_VARS_SERVER). (cmb)
 
 - Date:
   . Fixed bug GH-15582: Crash when not calling parent constructor of
diff --git a/main/php_variables.c b/main/php_variables.c
index eb442c3d2f9..bac5b1b673b 100644
--- a/main/php_variables.c
+++ b/main/php_variables.c
@@ -897,6 +897,7 @@ static bool php_auto_globals_create_server(zend_string *name)
 	} else {
 		zval_ptr_dtor_nogc(&PG(http_globals)[TRACK_VARS_SERVER]);
 		array_init(&PG(http_globals)[TRACK_VARS_SERVER]);
+		zend_hash_real_init_mixed(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]));
 	}
 
 	check_http_proxy(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]));
diff --git a/tests/basic/gh15905.phpt b/tests/basic/gh15905.phpt
new file mode 100644
index 00000000000..6636b970242
--- /dev/null
+++ b/tests/basic/gh15905.phpt
@@ -0,0 +1,12 @@
+--TEST--
+GH-15905 (Assertion failure for TRACK_VARS_SERVER)
+--INI--
+variables_order=E
+auto_globals_jit=0
+register_argc_argv=1
+--FILE--
+<?php
+echo "okay\n";
+?>
+--EXPECT--
+okay