Fix introduced bug

Signed-off-by: Christian Wolf <github@christianwolf.email>

.vscode/launch.json

@@ -31,6 +31,16 @@
         //        "/var/www/html": "${workspaceFolder:base}"
         //    }
         //},
+        {
+            "name": "Xdebug PHPUnit",
+            "type": "php",
+            "request": "launch",
+            "port": 9000,
+            "pathMappings": {
+                "/var/www/html/custom_apps/cookbook": "${workspaceFolder:cookbook}",
+                "/var/www/html": "${workspaceFolder:base}"
+            }
+        },
         {
             "name": "Xdebug on 9003",
             "type": "php",

lib/Helper/ISO8601DurationHelper.php

@@ -48,8 +48,8 @@ class ISO8601DurationHelper {
 
 		if ($ret === 1) {
 			$hours = (int)$matches[1];
-			$minutes = (int)$matches[2];
-			$seconds = (int)$matches[3];
+			$minutes = (int) ($matches[2] ?? 0);
+			$seconds = (int) ($matches[3] ?? 0);
 
 			while ($seconds >= 60) {
 				$seconds -= 60;