diff --git a/fp-includes/core/core.utils.php b/fp-includes/core/core.utils.php
index 101b389..48121ec 100644
--- a/fp-includes/core/core.utils.php
+++ b/fp-includes/core/core.utils.php
@@ -431,6 +431,9 @@ function fplog($str) {
  * @return unknown the shifted value, or NULL if array is empty or is not an array
  */
 function utils_array_kshift(&$arr) {
+	if (!is_array($arr) || count($arr) === 0) {
+		return null;
+	}
 	list ($k) = array_keys($arr);
 	$r = array(
 		$k => $arr [$k]