This is a comment on Upgrade to 5.5, posted by Mangalor at 26.04.2018 15:03

View source for Impossible to change properties of the user in Admin panel

One more bug: it is impossible to change properties of the user in Admin panel. It occurs because integer parameter user_id is quoted before transformation to int. It can be fixed as: %%--- user_users.php.orig
+++ user_users.php
@@ -218 +218 @@
- "AND user_id <> " . (int) $engine->db->q($_POST['user_id']) . " " .
+ "AND user_id <> " . (int) $_POST['user_id'] . " " .%%

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original is located at: ((/Comment606))