updated pdf code

src/main/java/net/gepafin/tendermanagement/dao/PdfDao.java

@@ -465,7 +465,7 @@ public class PdfDao {
                                 .collect(Collectors.toList());
                         fieldValue = names;
                     }
-                } else if (name.equals("checkboxes")) {
+                } else if (name.equals("checkboxes") && fieldValue instanceof List<?>) {
                     List<String> check = (List<String>) fieldValue;
                     List<SettingResponseBean> settingResponseBeans = content.getSettings();
                     List<String> matchedLabels = new ArrayList<>();