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Index: contributions/modules/masquerade/masquerade.module
--- contributions/modules/masquerade/masquerade.module Base (1.16.2.46)
+++ contributions/modules/masquerade/masquerade.module Locally Modified (Based On 1.16.2.46)
@@ -32,18 +32,18 @@
  * Implementation of hook_init().
  */
 function masquerade_init() {
-  global $user;
-
-  // load from table uid + session id
-  $uid = db_result(db_query("SELECT uid_from FROM {masquerade} WHERE sid = '%s' AND uid_as = %d", session_id(), $user->uid));
-  // using if so that we get unset rather than false if not masqing
-  if ($uid) {
-    $_SESSION['masquerading'] = $uid;
+  if (user_is_logged_in ()) {
+    // load from table uid + session id
+    $uid = db_result(db_query("SELECT uid_from FROM {masquerade} WHERE sid = '%s' AND uid_as = %d", session_id(), $GLOBALS['user']->uid));
+    // using if so that we get unset rather than false if not masqing
+    if ($uid) {
+      $_SESSION['masquerading'] = $uid;
+    }
+    // Don't initialize $_SESSION for anonymous users to keep Pressflow compatiblity
+    elseif (isset($_SESSION['masquerading'])) {
+      $_SESSION['masquerading'] = NULL;
+    }
   }
-  // Don't initialize $_SESSION for anonymous users to keep Pressflow compatiblity
-  elseif (isset($_SESSION['masquerading'])) {
-    $_SESSION['masquerading'] = NULL;
-  }
 }
 
 /**