From 997f18f65882a2df2f14c9f61536403ad98af128 Mon Sep 17 00:00:00 2001
From: reger <reger18@arcor.de>
Date: Tue, 1 Dec 2015 00:06:50 +0100
Subject: [PATCH] prevent exception on repeated ViewImage with same urlLicense

---
 htroot/ViewImage.java | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/htroot/ViewImage.java b/htroot/ViewImage.java
index d6838dc8b..c93473030 100644
--- a/htroot/ViewImage.java
+++ b/htroot/ViewImage.java
@@ -107,8 +107,13 @@ public class ViewImage {
 		}
 
 		if ((url == null) && (urlLicense.length() > 0)) {
-			urlString = URLLicense.releaseLicense(urlLicense);
-			url = new DigestURL(urlString);
+                    urlString = URLLicense.releaseLicense(urlLicense);
+                    if (urlString != null) {
+                        url = new DigestURL(urlString);
+                    } else { // license is gone (e.g. released/remove in prev calls)
+                        ConcurrentLog.fine("ViewImage", "image urlLicense not found key=" + urlLicense);
+                        return null; //TODO: maybe favicon accessed again, check iconcache
+                    }
 		}
 
 		// get the image as stream