Bugfix: fix crash when attempting to leave a top-level comment

Changelog.md

@@ -9,6 +9,7 @@ This file holds the changelog for Pepperminty Wiki. This is the master list of t
 
 ### Fixed
  - Stats: Fix crash when loading the stats page
+ - Fix crash when leaving a top-level comment
  - [security] Fixed an XSS vulnerability in the `format` GET parameter of the `stats` action (thanks, @JamieSlome)
  - [security] Ensured that the `returnto` GET parameter leads you only to another place on your Pepperminty Wiki instance (thanks, @JamieSlome)
  - [security] Ensure that Javascript in SVGs never gets executed (it's too challenging to strip it, since it could be lurking in many different places - according to [this answer](https://stackoverflow.com/a/68505306/1460422) even Inkscape doesn't strip all Javascript when asked to)

modules/feature-comments.php

@@ -5,7 +5,7 @@
 
 register_module([
 	"name" => "Page Comments",
-	"version" => "0.3.4",
+	"version" => "0.3.5",
 	"author" => "Starbeamrainbowlabs",
 	"description" => "Adds threaded comments to the bottom of every page.",
 	"id" => "feature-comments",
@@ -134,7 +134,7 @@ register_module([
 					"timestamp" => time(),
 					"page" => $env->page,
 					"user" => $env->user,
-					"reply_depth" => count($comment_thread),
+					"reply_depth" => $comment_thread !== null ? count($comment_thread) : 0,
 					"comment_id" => $new_comment->id
 				]);
 			}