diff --git a/src/fr/devinsy/xidyn/presenters/URLPresenter.java b/src/fr/devinsy/xidyn/presenters/URLPresenter.java
index db76b31..8511c7b 100644
--- a/src/fr/devinsy/xidyn/presenters/URLPresenter.java
+++ b/src/fr/devinsy/xidyn/presenters/URLPresenter.java
@@ -197,31 +197,51 @@ public class URLPresenter extends StringPresenter
 	public void setSource(final String source)
 	{
 		//
-		URL url;
 		if (source == null)
 		{
-			url = null;
-		}
-		else if (source.matches(".+://.+"))
-		{
-			try
-			{
-				url = new URL(source);
-			}
-			catch (final MalformedURLException exception)
-			{
-				// TODO
-				logger.warn("UNKNOWN PROTOCOL [" + source + "]");
-				url = null;
-			}
+			this.source = null;
+			this.sourcePathname = null;
+			this.sourceTime = 0;
+			super.setSource(null);
 		}
 		else
 		{
-			url = URLPresenter.class.getResource(source);
-		}
+			//
+			URL url;
+			if (source.matches(".+://.+"))
+			{
+				try
+				{
+					url = new URL(source);
+				}
+				catch (final MalformedURLException exception)
+				{
+					// TODO
+					logger.warn("UNKNOWN PROTOCOL [" + source + "]");
+					url = null;
+				}
+			}
+			else
+			{
+				url = URLPresenter.class.getResource(source);
+			}
 
-		//
-		setSource(url);
+			//
+			if (url == null)
+			{
+				this.source = null;
+				this.sourcePathname = source;
+				this.sourceTime = 0;
+				super.setSource(null);
+			}
+			else
+			{
+				this.source = url;
+				this.sourcePathname = source;
+				this.sourceTime = 0;
+				super.setSource(null);
+			}
+		}
 	}
 
 	/**
@@ -282,7 +302,7 @@ public class URLPresenter extends StringPresenter
 		//
 		if (this.source == null)
 		{
-			String errorMessage = "source not defined";
+			String errorMessage = "source not defined (" + this.sourcePathname + ")";
 			logger.error(errorMessage);
 			throw new NullPointerException(errorMessage);
 		}