diff --git a/Sources/Actions/Admin/Permissions.php b/Sources/Actions/Admin/Permissions.php
index fc218e7a05..5c9881ef88 100644
--- a/Sources/Actions/Admin/Permissions.php
+++ b/Sources/Actions/Admin/Permissions.php
@@ -2470,7 +2470,7 @@ protected function setGroupsContext(): void
 			];
 		}
 
-		Group::countPermissionsBatch(array_keys(Utils::$context['groups']), (int) $_REQUEST['pid'] ?? null);
+		Group::countPermissionsBatch(array_keys(Utils::$context['groups']), isset($_REQUEST['pid']) ? (int) $_REQUEST['pid'] : null);
 	}
 
 	/**
diff --git a/Sources/Actions/Admin/Server.php b/Sources/Actions/Admin/Server.php
index bae7d5a9f1..e864c51b29 100644
--- a/Sources/Actions/Admin/Server.php
+++ b/Sources/Actions/Admin/Server.php
@@ -263,7 +263,7 @@ public function general(): void
 
 			// Ensure all URLs are aligned with the new force_ssl setting
 			// Treat unset like 0
-			$this->alignURLsWithSSLSetting((int) $_POST['force_ssl'] ?? 0);
+			$this->alignURLsWithSSLSetting((int) ($_POST['force_ssl'] ?? 0));
 
 			ACP::saveSettings($config_vars);
 			$_SESSION['adm-save'] = true;
diff --git a/Sources/Actions/Unread.php b/Sources/Actions/Unread.php
index 9557291c1f..e81fa9ad2f 100644
--- a/Sources/Actions/Unread.php
+++ b/Sources/Actions/Unread.php
@@ -874,8 +874,8 @@ protected function getTopicRequestWithoutTempTable(): void
 		list($num_topics, $min_message) = Db::$db->fetch_row($request);
 		Db::$db->free_result($request);
 
-		$this->num_topics = (int) $num_topics ?? 0;
-		$this->min_message = (int) $min_message ?? 0;
+		$this->num_topics = (int) ($num_topics ?? 0);
+		$this->min_message = (int) ($min_message ?? 0);
 
 		if ($this->num_topics == 0) {
 			$this->setNoTopics();
diff --git a/Sources/Actions/UnreadReplies.php b/Sources/Actions/UnreadReplies.php
index 91ba934a8f..5820093a55 100644
--- a/Sources/Actions/UnreadReplies.php
+++ b/Sources/Actions/UnreadReplies.php
@@ -323,8 +323,8 @@ protected function getTopicRequestWithoutTempTable(): void
 		list($num_topics, $min_message) = Db::$db->fetch_row($request);
 		Db::$db->free_result($request);
 
-		$this->num_topics = (int) $num_topics ?? 0;
-		$this->min_message = (int) $min_message ?? 0;
+		$this->num_topics = (int) ($num_topics ?? 0);
+		$this->min_message = (int) ($min_message ?? 0);
 
 		if ($this->num_topics == 0) {
 			$this->setNoTopics();
diff --git a/Sources/Profile.php b/Sources/Profile.php
index 534f63609f..4bad5caf6e 100644
--- a/Sources/Profile.php
+++ b/Sources/Profile.php
@@ -2800,8 +2800,8 @@ protected function setAvatarAttachment(string $filepath): ?string
 		}
 
 		// Check whether the image is too large.
-		$max_width = (int) Config::$modSettings['avatar_max_width_external'] ?? 0;
-		$max_height = (int) Config::$modSettings['avatar_max_height_external'] ?? 0;
+		$max_width = (int) (Config::$modSettings['avatar_max_width_external'] ?? 0);
+		$max_height = (int) (Config::$modSettings['avatar_max_height_external'] ?? 0);
 
 		if ($image->shouldResize($max_width, $max_height)) {
 			// Try to resize it, unless the admin disabled resizing.
diff --git a/Sources/Subs-Compat.php b/Sources/Subs-Compat.php
index 643cc947bf..ac17edbbed 100644
--- a/Sources/Subs-Compat.php
+++ b/Sources/Subs-Compat.php
@@ -3225,7 +3225,7 @@ function read_tgz_file(
 	): array|bool {
 		return PackageManager\SubsPackage::read_tgz_file(
 			$gzfilename,
-			(string) $destination ?? null,
+			isset($destination) ? (string) $destination : null,
 			$single_file,
 			$overwrite,
 			$files_to_extract,
diff --git a/Sources/User.php b/Sources/User.php
index 8baa6d3645..4cb9fd5766 100644
--- a/Sources/User.php
+++ b/Sources/User.php
@@ -935,7 +935,7 @@ class User implements \ArrayAccess
 	public function __set(string $prop, mixed $value): void
 	{
 		if (in_array($this->prop_aliases[$prop] ?? $prop, ['additional_groups', 'buddies', 'ignoreusers', 'ignoreboards']) && is_string($value)) {
-			$prop = (string) $this->prop_aliases[$prop] ?? $prop;
+			$prop = (string) ($this->prop_aliases[$prop] ?? $prop);
 			$value = array_map('intval', array_filter(explode(',', $value), 'strlen'));
 		}