diff --git a/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/PrintService.java b/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/PrintService.java
index 563e93c277..afc9f2ad11 100644
--- a/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/PrintService.java
+++ b/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/PrintService.java
@@ -2582,7 +2582,7 @@ private List<PropertyDefinition<?>> createHeadApplicationAll(Session session, Fo
     }
 
     private HSSFSheet createSheet(HSSFWorkbook wb, String sheetName, List<String> head) {
-        HSSFSheet sheet = wb.createSheet(sheetName);
+        HSSFSheet sheet = wb.createSheet(HSSFUtil.getSheetNameValid(sheetName));
         HSSFRow headRow = sheet.createRow(0);
         headRow.setHeight((short) 500);
         HSSFCellStyle headStyle = wb.createCellStyle();
@@ -3284,7 +3284,7 @@ private HSSFCell createCellNumeric(HSSFRow row, int index) {
 
     protected HSSFWorkbook createHSSFWorkbook(List<String> head, String sheetName) {
         HSSFWorkbook wb = new HSSFWorkbook();
-        HSSFSheet sheet = wb.createSheet(sheetName);
+        HSSFSheet sheet = wb.createSheet(HSSFUtil.getSheetNameValid(sheetName));
         HSSFRow headRow = sheet.createRow(0);
         headRow.setHeight((short) 500);
         HSSFCellStyle headStyle = wb.createCellStyle();
diff --git a/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/application/ApplicationService.java b/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/application/ApplicationService.java
index cee31e871b..49310b74b9 100644
--- a/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/application/ApplicationService.java
+++ b/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/service/application/ApplicationService.java
@@ -1518,7 +1518,7 @@ public String exportSchedeValutazione(Session currentCMISSession, String idCall,
                     for (HSSFPictureData picture : workbook.getAllPictures()) {
                         pictureId = wb.addPicture(picture.getData(), picture.getFormat());
                     }
-                    HSSFSheet newSheet = wb.createSheet(sheetName);
+                    HSSFSheet newSheet = wb.createSheet(HSSFUtil.getSheetNameValid(sheetName));
                     HSSFPrintSetup ps = newSheet.getPrintSetup();
                     ps.setLandscape(false);
                     HSSFUtil.copySheets(newSheet, workbook.getSheetAt(0), styleMap, pictureId);
diff --git a/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/util/HSSFUtil.java b/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/util/HSSFUtil.java
index 883be2c353..8e5286fc5d 100644
--- a/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/util/HSSFUtil.java
+++ b/cool-jconon-backend/src/main/java/it/cnr/si/cool/jconon/util/HSSFUtil.java
@@ -20,7 +20,8 @@
 import org.apache.poi.ss.util.CellRangeAddress;
 
 import java.util.Map;
- 
+import java.util.regex.Pattern;
+
 /**
  *
  * @author jk
@@ -119,5 +120,15 @@ public static void copyCell(HSSFCell oldCell, HSSFCell newCell, Map<Integer, HSS
                 break;
         }
          
-    }          
+    }
+
+    public static void main(String[] args) {
+        System.out.println(getSheetNameValid("Bando IEOS n. BR 18/2024"));
+    }
+
+    public static String getSheetNameValid(String sheetName) {
+        final Pattern pattern = Pattern.compile("[^A-Za-z0-9]", Pattern.CASE_INSENSITIVE);
+        return pattern.matcher(sheetName).replaceAll("-");
+    }
+
 }
\ No newline at end of file