From 393db3ba634b2ce89b49285719df3edf98ea97e4 Mon Sep 17 00:00:00 2001
From: Dennis Ushakov <dennis.ushakov@jetbrains.com>
Date: Fri, 5 Jul 2013 17:08:05 +0400
Subject: [PATCH] EA-46307

---
 .../src/com/intellij/help/impl/MacHelpUtil.java              | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/platform/platform-impl/src/com/intellij/help/impl/MacHelpUtil.java b/platform/platform-impl/src/com/intellij/help/impl/MacHelpUtil.java
index 66ed9bc4e7e6..cfbe60e0e162 100644
--- a/platform/platform-impl/src/com/intellij/help/impl/MacHelpUtil.java
+++ b/platform/platform-impl/src/com/intellij/help/impl/MacHelpUtil.java
@@ -21,13 +21,14 @@ import com.intellij.ui.mac.foundation.Foundation;
 import com.intellij.ui.mac.foundation.ID;
 import com.intellij.util.PlatformUtils;
 import org.jetbrains.annotations.NonNls;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * @author Dennis.Ushakov
  */
 public class MacHelpUtil {
-  static boolean invokeHelp(@NonNls String id) {
-    id = "top".equals(id) ? "startpage" : id;
+  static boolean invokeHelp(@NonNls @Nullable String id) {
+    id = id == null || "top".equals(id) ? "startpage" : id;
 
     final ID mainBundle = Foundation.invoke("NSBundle", "mainBundle");
     final ID helpBundle = Foundation.invoke(mainBundle, "objectForInfoDictionaryKey:", Foundation.nsString("CFBundleHelpBookName"));