fix: improve method of getting first array entry

src/Result.php

@@ -327,7 +327,7 @@ public function getErrorsFlat() {
 	 * Get a the first error (in flat format)
 	 */
 	public function getFirstErrorFlat() {
-		return $this->getErrorsFlat()[0];
+		return current($this->getErrorsFlat());
 	}
 
 	/**