diff --git a/ContributionScores_body.php b/ContributionScores_body.php
index 97d6fb2..6142c1f 100644
--- a/ContributionScores_body.php
+++ b/ContributionScores_body.php
@@ -213,7 +213,7 @@ class ContributionScores extends IncludableSpecialPage {
 		if ( empty( $limit ) || $limit < 1 || $limit > CONTRIBUTIONSCORES_MAXINCLUDELIMIT ) {
 			$limit = 10;
 		}
-		if ( is_null( $days ) || $days < 0 ) {
+		if ( $days === null || $days < 0 ) {
 			$days = 7;
 		}
 
diff --git a/composer.json b/composer.json
index ac7b9da..2d756c2 100644
--- a/composer.json
+++ b/composer.json
@@ -1,14 +1,14 @@
 {
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
-		"mediawiki/mediawiki-codesniffer": "28.0.0",
+		"mediawiki/mediawiki-codesniffer": "29.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2",
 		"mediawiki/minus-x": "0.3.2"
 	},
 	"scripts": {
 		"fix": [
-			"phpcbf",
-			"minus-x fix ."
+			"minus-x fix .",
+			"phpcbf"
 		],
 		"test": [
 			"parallel-lint . --exclude vendor --exclude node_modules",