1 files changed, 2 insertions, 1 deletions
diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/mobilebku/MobileBKUQRComposite.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/mobilebku/MobileBKUQRComposite.java
index 1b2600c8..e7603dbd 100644
--- a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/mobilebku/MobileBKUQRComposite.java
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/mobilebku/MobileBKUQRComposite.java
@@ -20,6 +20,7 @@ import java.io.ByteArrayInputStream;
 import java.net.URI;
 import java.util.Objects;
 
+import javax.annotation.CheckForNull;
 import javax.annotation.Nullable;
 
 import org.eclipse.swt.SWT;
@@ -99,7 +100,7 @@ public class MobileBKUQRComposite extends StateComposite {
 	}
 
 	public String getRefVal() { return this.refVal; }
-	public void setRefVal(String refVal) {
+	public void setRefVal(@CheckForNull String refVal) {
 		this.refVal = (refVal != null) ? refVal.trim() : null;
 		this.lblRefVal.setText(Objects.requireNonNullElse(this.refVal, ""));
 	}