Index: modules/org.sophie2.extra.func.pdf/src/main/java/org/sophie2/extra/func/pdf/model/PDFResource.java
===================================================================
--- modules/org.sophie2.extra.func.pdf/src/main/java/org/sophie2/extra/func/pdf/model/PDFResource.java	(revision 4748)
+++ modules/org.sophie2.extra.func.pdf/src/main/java/org/sophie2/extra/func/pdf/model/PDFResource.java	(working copy)
@@ -5,6 +5,7 @@
 import org.sophie2.base.commons.util.BinData;
 import org.sophie2.base.model.resources.Resource;
 import org.sophie2.base.model.resources.ResourceSpace;
+import org.sophie2.core.logging.SophieLog;
 import org.sophie2.core.prolib.errors.NotAvailableException;
 import org.sophie2.core.prolib.impl.AutoProperty;
 import org.sophie2.core.prolib.interfaces.Prop;
@@ -57,8 +58,8 @@
 				try {
 					return new PDFFile(pdfData().get().toByteBuffer());
 				} catch (IOException e) {
-					throw new RuntimeException(e);
-
+					SophieLog.error("Exception was thrown while trying to construct a PDFFile. Possible reason: file format is not PDF.");
+					return null;
 				}
 			}
 		}
Index: modules/org.sophie2.extra.func.pdf/src/main/java/org/sophie2/extra/func/pdf/view/logic/PDFLogic.java
===================================================================
--- modules/org.sophie2.extra.func.pdf/src/main/java/org/sophie2/extra/func/pdf/view/logic/PDFLogic.java	(revision 4748)
+++ modules/org.sophie2.extra.func.pdf/src/main/java/org/sophie2/extra/func/pdf/view/logic/PDFLogic.java	(working copy)
@@ -84,9 +84,14 @@
 					BinData pdfData = new BinData(pdfFile);
 					pdfResource.pdfData().set(pdfData);
 					pdfResource.pdfPageNum().set(0);
+					if (pdfResource.pdfFile().get() == null) {
+						DialogUtils.showErrorDialog(pageView.swingComponent()
+								.get(), "This may not be a PDF File", "Unsupported file format");
+						pdfResource = null;
+					}
 				} catch (final IOException e) {
 					DialogUtils.showExceptionDialog(pageView.swingComponent()
-							.get(), e, "Unsupported file format");
+							.get(), e, "Error");
 				}
 			}
 			return pdfResource;