Index: C:/Dev/xwiki1.3Patch/xwiki-core/src/main/java/com/xpn/xwiki/plugin/calendar/CalendarData.java
===================================================================
--- C:/Dev/xwiki1.3Patch/xwiki-core/src/main/java/com/xpn/xwiki/plugin/calendar/CalendarData.java	(revision 8050)
+++ C:/Dev/xwiki1.3Patch/xwiki-core/src/main/java/com/xpn/xwiki/plugin/calendar/CalendarData.java	(working copy)
@@ -235,11 +235,20 @@
         StringBuffer result = new StringBuffer();
         for (Iterator it = getCalendarData(tddate).iterator(); it.hasNext(); ) {
             CalendarEvent event = (CalendarEvent) it.next();
-            String user = event.getUser().trim();
+            
+            String user = event.getUser();
+            if (user != null){
+            	user.trim();
+            }
+            
             if ((filteredUser != null) && (!filteredUser.trim().equals("")) && (!filteredUser.trim().equals(user))) {
                 continue;
             }
-            String location = event.getLocation().trim();
+            String location = event.getLocation();
+            if (location != null){
+            	location.trim();
+            }
+            
             if ((filteredLocation != null) && (!filteredLocation.trim().equals("")) && (!filteredLocation.trim().equals(location))) {
                 continue;
             }
@@ -252,7 +261,10 @@
                 }
             }
             categories = event.getCategory();
-            String title = event.getTitle().trim();
+            String title = event.getTitle();
+            if (title != null){
+            	title.trim();
+            }
             String url = event.getUrl();
             result.append("<div class=\"event");
             if (categories != null && categories.size() > 0) {