X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=doubler.php;h=e8a088bc8cefdef9885e7ab482571898e9d1dcf1;hb=7065f8bbf8b530b09de76e5af61be37bd54ed7c4;hp=f2690ca9bdc4f6c5932ca0ab8bc5a55fd4c44649;hpb=52e8a0635bd0b7c653845685c55e4e5f251375fe;p=mailer.git

diff --git a/doubler.php b/doubler.php
index f2690ca9bd..e8a088bc8c 100644
--- a/doubler.php
+++ b/doubler.php
@@ -48,7 +48,7 @@ $CSS = "0";
 require ("inc/config.php");
 
 // Is the script installed?
-if (defined('mxchange_installed') && (mxchange_installed))
+if (defined('mxchange_installed') && (isBooleanConstantAndTrue('mxchange_installed')))
 {
 	// Probe for referral ID
 	if (!empty($_GET['refid'])) $GLOBALS['refid'] = bigintval($_GET['refid']);