diff --git a/Zend/tests/gh25299.phpt b/Zend/tests/gh25299.phpt
new file mode 100644
index 000000000000..b1fe486b0f58
--- /dev/null
+++ b/Zend/tests/gh25299.phpt
@@ -0,0 +1,23 @@
+--TEST--
+GH-25299 (Exception string code is lost after unserialize())
+--CREDITS--
+tacman
+--FILE--
+<?php
+
+class MyException extends Exception {
+    protected $code = 'HY000';
+}
+
+$e = unserialize(serialize(new MyException()));
+var_dump($e->getCode());
+
+$e = unserialize('O:9:"Exception":1:{s:7:"' . "\0*\0" . 'code";a:0:{}}');
+var_dump($e->getCode());
+
+?>
+--EXPECTF--
+string(5) "HY000"
+
+Warning: Undefined property: Exception::$code in %s on line %d
+NULL
diff --git a/Zend/tests/gh25299_ref.phpt b/Zend/tests/gh25299_ref.phpt
new file mode 100644
index 000000000000..c4e0d84a821c
--- /dev/null
+++ b/Zend/tests/gh25299_ref.phpt
@@ -0,0 +1,22 @@
+--TEST--
+GH-25299: Exception::__wakeup() keeps message and code held by reference
+--FILE--
+<?php
+
+class MyException extends Exception {
+    public $m = 'm';
+    public $c = 5;
+
+    public function __construct() {
+        $this->message = &$this->m;
+        $this->code = &$this->c;
+    }
+}
+
+$e = unserialize(serialize(new MyException()));
+var_dump($e->getMessage(), $e->getCode());
+
+?>
+--EXPECT--
+string(1) "m"
+int(5)
diff --git a/Zend/zend_exceptions.c b/Zend/zend_exceptions.c
index 6138e302bb5d..e6ec1bf90ee5 100644
--- a/Zend/zend_exceptions.c
+++ b/Zend/zend_exceptions.c
@@ -347,9 +347,10 @@ ZEND_METHOD(Exception, __construct)
 /* }}} */
 
 /* {{{ Exception unserialize checks */
-#define CHECK_EXC_TYPE(id, type) \
+#define CHECK_EXC_TYPE(id, type_mask) \
 	pvalue = zend_read_property_ex(i_get_exception_base(Z_OBJ_P(object)), Z_OBJ_P(object), ZSTR_KNOWN(id), 1, &value); \
-	if (Z_TYPE_P(pvalue) != IS_NULL && Z_TYPE_P(pvalue) != type) { \
+	ZVAL_DEREF(pvalue); \
+	if (Z_TYPE_P(pvalue) != IS_NULL && !((type_mask) & (1u << Z_TYPE_P(pvalue)))) { \
 		zend_unset_property(i_get_exception_base(Z_OBJ_P(object)), Z_OBJ_P(object), ZSTR_VAL(ZSTR_KNOWN(id)), ZSTR_LEN(ZSTR_KNOWN(id))); \
 	}
 
@@ -359,8 +360,8 @@ ZEND_METHOD(Exception, __wakeup)
 
 	zval value, *pvalue;
 	zval *object = ZEND_THIS;
-	CHECK_EXC_TYPE(ZEND_STR_MESSAGE, IS_STRING);
-	CHECK_EXC_TYPE(ZEND_STR_CODE,    IS_LONG);
+	CHECK_EXC_TYPE(ZEND_STR_MESSAGE, MAY_BE_STRING);
+	CHECK_EXC_TYPE(ZEND_STR_CODE,    MAY_BE_LONG | MAY_BE_STRING);
 	/* The type of all other properties is enforced through typed properties. */
 }
 /* }}} */