From 7ab07367d025b29794f99e26be98ee8496da157a Mon Sep 17 00:00:00 2001
From: Daniel Tschinder <daniel.tschinder@researchgate.net>
Date: Wed, 16 Jul 2014 15:46:36 +0200
Subject: [PATCH] Fix fatal error for empty yields

---
 .../PDepend/Source/Language/PHP/AbstractPHPParser.php | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/main/php/PDepend/Source/Language/PHP/AbstractPHPParser.php b/src/main/php/PDepend/Source/Language/PHP/AbstractPHPParser.php
index 80002ad79..d6182fe42 100644
--- a/src/main/php/PDepend/Source/Language/PHP/AbstractPHPParser.php
+++ b/src/main/php/PDepend/Source/Language/PHP/AbstractPHPParser.php
@@ -6583,12 +6583,15 @@ private function parseYield()
 
         $yield = $this->builder->buildAstYieldStatement($token->image);
 
-        $yield->addChild($this->parseOptionalExpression());
+        $node = $this->parseOptionalExpression();
+        if ($node) {
+            $yield->addChild($node);
 
-        if ($this->tokenizer->peek() === Tokens::T_DOUBLE_ARROW) {
-            $this->consumeToken(Tokens::T_DOUBLE_ARROW);
+            if ($this->tokenizer->peek() === Tokens::T_DOUBLE_ARROW) {
+                $this->consumeToken(Tokens::T_DOUBLE_ARROW);
 
-            $yield->addChild($this->parseOptionalExpression());
+                $yield->addChild($this->parseOptionalExpression());
+            }
         }
 
         $this->consumeComments();