diff --git a/includes/database/log.inc b/includes/database/log.inc
index ec27ef8e6332ad6543ce7b489b0048b4aa3a8034..27eae62cd2a7c6dd77b03e97083a35b8d71ffa23 100644
--- a/includes/database/log.inc
+++ b/includes/database/log.inc
@@ -128,9 +128,10 @@ public function log(DatabaseStatementInterface $statement, $args, $time) {
    * Determine the routine that called this query.
    *
    * We define "the routine that called this query" as the first entry in
-   * the call stack that is not inside includes/database. That makes the
-   * climbing logic very simple, and handles the variable stack depth caused
-   * by the query builders.
+   * the call stack that is not inside includes/database and does have a file
+   * (which excludes call_user_func_array(), anonymous functions and similar).
+   * That makes the climbing logic very simple, and handles the variable stack
+   * depth caused by the query builders.
    *
    * @link http://www.php.net/debug_backtrace
    * @return
@@ -144,7 +145,8 @@ public function findCaller() {
     $stack = debug_backtrace();
     $stack_count = count($stack);
     for ($i = 0; $i < $stack_count; ++$i) {
-      if (strpos($stack[$i]['file'], 'includes' . DIRECTORY_SEPARATOR . 'database') === FALSE) {
+      if (!empty($stack[$i]['file']) && strpos($stack[$i]['file'], 'includes' . DIRECTORY_SEPARATOR . 'database') === FALSE) {
+        $stack[$i] += array('args' => array());
         return array(
           'file' => $stack[$i]['file'],
           'line' => $stack[$i]['line'],
diff --git a/modules/simpletest/tests/database_test.test b/modules/simpletest/tests/database_test.test
index 660833606d75ae9a719a9cba3ee1b3d3de43dc68..13e907c85b549d4a78563a3a41eff48c94d1e6b1 100644
--- a/modules/simpletest/tests/database_test.test
+++ b/modules/simpletest/tests/database_test.test
@@ -2803,14 +2803,17 @@ class DatabaseLoggingTestCase extends DatabaseTestCase {
    * Test that we can log the existence of a query.
    */
   function testEnableLogging() {
-    Database::startLog('testing');
+    $log = Database::startLog('testing');
 
     db_query('SELECT name FROM {test} WHERE age > :age', array(':age' => 25))->fetchCol();
     db_query('SELECT age FROM {test} WHERE name = :name', array(':name' => 'Ringo'))->fetchCol();
 
+    // Trigger a call that does not have file in the backtrace.
+    call_user_func_array('db_query', array('SELECT age FROM {test} WHERE name = :name', array(':name' => 'Ringo')))->fetchCol();
+
     $queries = Database::getLog('testing', 'default');
 
-    $this->assertEqual(count($queries), 2, t('Correct number of queries recorded.'));
+    $this->assertEqual(count($queries), 3, t('Correct number of queries recorded.'));
 
     foreach ($queries as $query) {
       $this->assertEqual($query['caller']['function'], __FUNCTION__, t('Correct function in query log.'));