diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index aed4077..c56865b 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -1,5 +1,5 @@
 parameters:
-    level: 2
+    level: 3
     paths:
         - wp-multi-network/includes
         - wpmn-loader.php
diff --git a/wp-multi-network/includes/classes/class-wp-ms-networks-list-table.php b/wp-multi-network/includes/classes/class-wp-ms-networks-list-table.php
index a64b200..72cdd4b 100644
--- a/wp-multi-network/includes/classes/class-wp-ms-networks-list-table.php
+++ b/wp-multi-network/includes/classes/class-wp-ms-networks-list-table.php
@@ -414,7 +414,7 @@ protected function handle_row_actions( $network, $column_name, $primary ) {
 
 		// Bail if not primary column.
 		if ( $primary !== $column_name ) {
-			return;
+			return '';
 		}
 
 		switch_to_network( $network->id );
diff --git a/wp-multi-network/includes/functions.php b/wp-multi-network/includes/functions.php
index 791ddd2..67801a3 100644
--- a/wp-multi-network/includes/functions.php
+++ b/wp-multi-network/includes/functions.php
@@ -120,7 +120,7 @@ function user_has_networks( $user_id = 0 ) {
 	 * @since 1.3.0
 	 *
 	 * @param int|WP_Network $network Optional. Network ID or object. Default is the current network.
-	 * @return int Main site ID for the network.
+	 * @return int|bool Main site ID for the network or false if network not found.
 	 */
 	function get_main_site_for_network( $network = null ) {
 		$network = get_network( $network );
diff --git a/wpmn-loader.php b/wpmn-loader.php
index fd45e57..9728bbc 100644
--- a/wpmn-loader.php
+++ b/wpmn-loader.php
@@ -69,7 +69,7 @@ class WPMN_Loader {
 	 * @since 1.3.0
 	 * @var string
 	 */
-	public $asset_version = 202108250001;
+	public $asset_version = '202108250001';
 
 	/**
 	 * Network admin class instance.