diff --git a/api/src/Db/test/SchemaTest.php b/api/src/Db/test/SchemaTest.php
index 73552f9d5e..d113ae84a1 100644
--- a/api/src/Db/test/SchemaTest.php
+++ b/api/src/Db/test/SchemaTest.php
@@ -390,6 +390,7 @@ class SchemaTest extends LoggedInTest {
 		unset($columns['options']);
 
 		$exist = False;
+		$idx_data = array();
 		foreach($indexes as $idx_data)
 		{
 			if (implode(':',$columns) == strtolower(implode(':',$idx_data['columns'])))