diff --git a/includes/FeedsConfigurable.inc b/includes/FeedsConfigurable.inc
index 67bf748..7549d7b 100644
--- a/includes/FeedsConfigurable.inc
+++ b/includes/FeedsConfigurable.inc
@@ -112,7 +112,7 @@ abstract class FeedsConfigurable {
    */
   public function setConfig($config) {
     $defaults = $this->configDefaults();
-    $this->config = array_intersect_key($config, $defaults) + $defaults;
+    $this->config = array_intersect_key((array) $config, $defaults) + $defaults;
   }
 
   /**
@@ -123,7 +123,7 @@ abstract class FeedsConfigurable {
    *   returned by configDefaults().
    */
   public function addConfig($config) {
-    $this->config = array_merge($this->config, $config);
+    $this->config = array_merge($this->config, (array) $config);
     $default_keys = $this->configDefaults();
     $this->config = array_intersect_key($this->config, $default_keys);
   }