2 files changed, 8 insertions, 0 deletions
diff --git a/poi-examples/src/main/java/org/apache/poi/examples/ss/CellStyleDetails.java b/poi-examples/src/main/java/org/apache/poi/examples/ss/CellStyleDetails.java
index 6997a9e8fa..ce69271805 100644
--- a/poi-examples/src/main/java/org/apache/poi/examples/ss/CellStyleDetails.java
+++ b/poi-examples/src/main/java/org/apache/poi/examples/ss/CellStyleDetails.java
@@ -47,6 +47,10 @@ public final class CellStyleDetails {
         }
 
         try (Workbook wb = WorkbookFactory.create(new File(args[0]))) {
+            if (wb == null) {
+                System.out.println("Workbook "+args[0]+" can't be loaded.");
+                return;
+            }
             DataFormatter formatter = new DataFormatter();
 
             for (int sn = 0; sn < wb.getNumberOfSheets(); sn++) {
diff --git a/poi-examples/src/main/java/org/apache/poi/examples/ss/formula/UserDefinedFunctionExample.java b/poi-examples/src/main/java/org/apache/poi/examples/ss/formula/UserDefinedFunctionExample.java
index 939fd9ab9d..be03faebbb 100644
--- a/poi-examples/src/main/java/org/apache/poi/examples/ss/formula/UserDefinedFunctionExample.java
+++ b/poi-examples/src/main/java/org/apache/poi/examples/ss/formula/UserDefinedFunctionExample.java
@@ -54,6 +54,10 @@ public final class UserDefinedFunctionExample {
         File workbookFile = new File( args[0] ) ;
 
         try (Workbook workbook = WorkbookFactory.create(workbookFile, null, true)) {
+            if (workbook == null) {
+                System.out.println("Workbook "+workbookFile+" can't be loaded.");
+                return;
+            }
             String[] functionNames = {"calculatePayment"};
             FreeRefFunction[] functionImpls = {new CalculateMortgage()};