1 files changed, 18 insertions, 3 deletions
diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/BinarySignature.java b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/BinarySignature.java
index bc399f0..ae1ce12 100644
--- a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/BinarySignature.java
+++ b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/BinarySignature.java
@@ -966,15 +966,30 @@ public abstract class BinarySignature
     }
   }
   
-  private static void replacePlaceholder(PdfStamper stamper, int pageNr, String placeholderName) throws BadElementException, MalformedURLException, IOException, BadPdfFormatException {
+  private static void replacePlaceholder(PdfStamper stamper, int pageNr, String placeholderName) throws BadElementException, MalformedURLException, IOException, BadPdfFormatException, PresentableException {
      Image img = Image.getInstance(SignaturePlaceholderData.class.getResource("empty.jpg"));
      PdfImage pImg = new PdfImage(img, "Imwurscht", null);
      PdfStamperImp stamperImp = (PdfStamperImp)stamper.getWriter();
      PdfIndirectObject ind = stamperImp.addToBody(pImg);
      
      PdfDictionary resources = stamper.getReader().getPageN(pageNr).getAsDict(PdfName.RESOURCES);
-     resources.getAsDict(PdfName.XOBJECT).put(new PdfName(placeholderName), ind.getIndirectReference());
-     stamperImp.markUsed(resources);
+     if (ind != null && resources != null)
+     {
+        PdfDictionary xobjDict = resources.getAsDict(PdfName.XOBJECT);
+        if (xobjDict != null)
+        {
+           xobjDict.put(new PdfName(placeholderName), ind.getIndirectReference());
+           stamperImp.markUsed(resources);
+        }
+        else
+        {
+           throw new PresentableException(ErrorCode.CANNOT_WRITE_PDF, new NullPointerException("Image dictionary not found in document structure!"));
+        }
+     }
+     else
+     {
+        throw new PresentableException(ErrorCode.CANNOT_WRITE_PDF, new NullPointerException("Resource dictionary not found in document structure!"));
+     }
   }