diff --git a/src/main/scala/gitbucket/core/service/AccountService.scala b/src/main/scala/gitbucket/core/service/AccountService.scala
index 04d7a41..06133fc 100644
--- a/src/main/scala/gitbucket/core/service/AccountService.scala
+++ b/src/main/scala/gitbucket/core/service/AccountService.scala
@@ -186,7 +186,7 @@
 
   def getGroupNames(userName: String)(implicit s: Session): List[String] = {
     List(userName) ++
-      Collaborators.filter(_.collaboratorName === userName.bind).sortBy(_.userName).map(_.userName).list
+      Collaborators.filter(_.collaboratorName === userName.bind).sortBy(_.userName).map(_.userName).list.distinct
   }
 
 }