diff --git a/src/main/java/info/bukova/isspst/security/IsspstPermissionEvaluator.java b/src/main/java/info/bukova/isspst/security/IsspstPermissionEvaluator.java
index 8dc534ff..6b118cbd 100644
--- a/src/main/java/info/bukova/isspst/security/IsspstPermissionEvaluator.java
+++ b/src/main/java/info/bukova/isspst/security/IsspstPermissionEvaluator.java
@@ -76,6 +76,11 @@ public class IsspstPermissionEvaluator implements PermissionEvaluator {
 		
 		for (Workgroup wg : userWorkgroups) {
 			List<Role> wgRoles = wgService.getUserWorkgroupRoles(wg, user);
+			
+			if (wgRoles == null) {
+				continue;
+			}
+			
 			for (Role r : wgRoles) {
 				for (Permission p : r.getPermissions()) {
 					if (p.getAuthority().equals(permission.getAuthority())) {