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-rw-r--r--include/zid.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/zid.php b/include/zid.php
index 05b4cee16..159a3b834 100644
--- a/include/zid.php
+++ b/include/zid.php
@@ -38,7 +38,7 @@ function is_matrix_url($url) {
* @return string
*/
function zid($s, $address = '') {
- if ($s || strpos($s,'zid=')) {
+ if (!$s || strpos($s,'zid=')) {
return $s;
}