Issue #2848252 by lhridley, Jeremy: drush clear-cache results in: array_merge(): Argument #2 is not an array dmemcache.inc:404

Author: Jeremy Andrews

dmemcache.inc

@@ -399,17 +399,20 @@ function dmemcache_get_multi($keys, $bin = 'cache', $mc = NULL) {
 
       $results = @$mc->get($full_keys);
 
-      // Order is not guaranteed, map responses to order of requests.
-      $keys = array_fill_keys($full_keys, NULL);
-      $results = array_merge($keys, $results);
-
       if (!empty($php_errormsg)) {
         register_shutdown_function('watchdog', 'memcache', 'Exception caught in dmemcache_get_multi: !msg', array('!msg' => $php_errormsg), WATCHDOG_WARNING);
         $php_errormsg = '';
       }
       ini_set('track_errors', $track_errors);
+
+      // Order is not guaranteed, map responses to order of requests.
+      if (is_array($results)) {
+        $keys = array_fill_keys($full_keys, NULL);
+        $results = array_merge($keys, $results);
+      }
     }
   }
+
   // If $results is FALSE, convert it to an empty array.
   if (!$results) {
     $results = array();