diff --git a/www/index.html b/www/index.html
index 68776166..d5021b2e 100644
--- a/www/index.html
+++ b/www/index.html
@@ -60,8 +60,8 @@ License:
 	It's only a proof of concept so far : there are many many ways this could be enhanced (suggestions and patches are welcome : the source code is on <a href="https://github.com/mossroy/evopedia-html5">github</a>). In particular :
 	<ul>
 	<li>The performance should be optimized when reading an article</li>
-	<li>Searches are not always very accurate</li>
-	<li>The links inside an article do not work well</li>
+	<li>Some searches (starting with prefix "a" for example) do not give any result where they should</li>
+	<li>The links inside an article do not work very well</li>
 	<li>On a real device (with small memory) and a normal dump, reading an article crashes because it loads too many things in memory</li>
 	<li>It is hardly usable on a device because the buttons and inputs are too small</li>
 	</ul>
@@ -77,11 +77,7 @@ License:
 	<br /> Choose a title from the filtered list :
 	<select id="titleList"></select>
 	<br />
-	<input type="button" id="toggleDebug" value="Switch debug on/off" />
 	<input type="button" id="readData" value="Read article from dump" />
-	<div id="debugZone" style="display: none;">
-		<textarea id="debugTextarea" cols="80" rows="10">&nbsp;</textarea>
-	</div>
 	<div id="articleContent">&nbsp;</div>
 	<hr />
     
diff --git a/www/js/app.js b/www/js/app.js
index 4601a2ef..a31843a7 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -27,9 +27,6 @@ define(function(require) {
     $('#searchTitles').on('click', function(e) {
     	searchTitlesFromPrefix($('#prefix').val());
     });
-    $('#toggleDebug').on('click', function(e) {
-    	switchDebugOnOff();
-    });
     $('#readData').on('click', function(e) {
     	findTitleFromTitleIdAndLaunchArticleRead($('#titleList').val());
     });
@@ -65,32 +62,6 @@ define(function(require) {
 		$('#titleFile').on('change', setLocalArchiveFromFileSelect);
 	}
 
-	var debugOn = false;
-
-	/**
-	 * Print the given string inside the debug zone
-	 * 
-	 * @param string
-	 */
-	function debug(string) {
-		if (debugOn) {
-			document.getElementById("debugTextarea").value += string + "\n";
-		}
-	}
-
-	/**
-	 * Switch debug mode On/Off
-	 */
-	function switchDebugOnOff() {
-		if (debugOn == true) {
-			debugOn = false;
-			$('#debugZone').hide();
-		} else {
-			debugOn = true;
-			$('#debugZone').show();
-		}
-	}
-
 	function setLocalArchiveFromFileSelect() {
 		dataFiles=document.getElementById('dataFiles').files;
 		titleFile=document.getElementById('titleFile').files[0];
diff --git a/www/js/lib/evopedia.js b/www/js/lib/evopedia.js
index ec9c5bed..c52c79da 100644
--- a/www/js/lib/evopedia.js
+++ b/www/js/lib/evopedia.js
@@ -346,6 +346,10 @@ define(function(require) {
 		reader.onload = function(e) {
 			var binaryTitleFile = e.target.result;
 			var byteArray = new Uint8Array(binaryTitleFile);
+			
+			if (byteArray.length==0) {
+				throw "Unable to find redirected article : offset "+title.blockStart+" not found in title file";
+			}
 
 			var redirectedTitle = title;
 			redirectedTitle.fileNr = byteArray[2];