Fixed possible crash because of overriden error handler

Zend/tests/closure_031.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Closure 031: Closure properties with custom error handlers
+--FILE--
+<?php
+function foo($errno, $errstr, $errfile, $errline) {
+	echo "Error: $errstr\n";
+}
+set_error_handler('foo');
+$foo = function() {
+};
+var_dump($foo->a);
+?>
+--EXPECT--
+Error: Closure object cannot have properties
+NULL
+

Zend/zend_closures.c

@@ -140,7 +140,8 @@ static zend_function *zend_closure_get_method(zval **object_ptr, zstr method_nam
 static zval *zend_closure_read_property(zval *object, zval *member, int type TSRMLS_DC) /* {{{ */
 {
 	ZEND_CLOSURE_PROPERTY_ERROR();
-	return NULL;
+	Z_ADDREF(EG(uninitialized_zval));
+	return &EG(uninitialized_zval);
 }
 /* }}} */