Index: branches/RC/core/units/general/helpers/json_helper.php
===================================================================
diff -u -N -r11706 -r11743
--- branches/RC/core/units/general/helpers/json_helper.php	(.../json_helper.php)	(revision 11706)
+++ branches/RC/core/units/general/helpers/json_helper.php	(.../json_helper.php)	(revision 11743)
@@ -51,7 +51,7 @@
 					if (is_int($data) || is_float($data)) {
 						$data = (string)$data;
 					} elseif (is_string($data)) {
-						$data = "'".$this->escape($data)."'";
+						$data = '"'.$this->escape($data).'"';
 					} elseif (is_bool($data)) {
 						$data = $data ? 'true' : 'false';
 					} else {