diff --git a/.github/workflows/core-build.yml b/.github/workflows/core-build.yml
index b793067..b659600 100644
--- a/.github/workflows/core-build.yml
+++ b/.github/workflows/core-build.yml
@@ -8,8 +8,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        compiler: [clang6, clang9, clang10]
-    runs-on: ubuntu-20.04
+        compiler: [clang]
+    runs-on: ubuntu-latest
     name: ${{ matrix.compiler }}
     env:
       COMPILER: ${{ matrix.compiler }}
@@ -42,4 +42,4 @@ jobs:
       - name: Dry run
         run: source ./apps/ci/ci-worldserver-dry-run.sh
       - name: Check startup errors
-        run: source ./apps/ci/ci-error-check.sh
\ No newline at end of file
+        run: source ./apps/ci/ci-error-check.sh
diff --git a/src/reward_system.cpp b/src/reward_system.cpp
index 9ca35b3..2eaecaf 100644
--- a/src/reward_system.cpp
+++ b/src/reward_system.cpp
@@ -13,6 +13,7 @@ uint32 Max_roll;
 
 class reward_system : public PlayerScript
 {
+
 public:
     reward_system() : PlayerScript("reward_system") {}
 
@@ -76,7 +77,7 @@ public:
 
         ChatHandler(receiver->GetSession()).PSendSysMessage("You will receive your item in your mailbox");
         // format: name "subject text" "mail text" item1[:count1] item2[:count2] ... item12[:count12]
-        uint64 receiverGuid = receiver->GetGUID();
+        uint64 receiverGuid = receiver->GetGUID().GetCounter();
         std::string receiverName;
 
         std::string subject = "Reward System prize";
@@ -115,7 +116,7 @@ public:
         }
 
         // from console show not existed sender
-        MailSender sender(MAIL_NORMAL, receiver->GetSession() ? receiver->GetGUIDLow() : 0, MAIL_STATIONERY_TEST);
+        MailSender sender(MAIL_NORMAL, receiver->GetSession() ? receiver->GetGUID().GetCounter() : 0, MAIL_STATIONERY_TEST);
 
         // fill mail
         MailDraft draft(subject, text);
@@ -131,7 +132,7 @@ public:
             }
         }
 
-        draft.SendMailTo(trans, MailReceiver(receiver, GUID_LOPART(receiverGuid)), sender);
+        draft.SendMailTo(trans, MailReceiver(receiver, receiverGuid), sender);
         CharacterDatabase.CommitTransaction(trans);
 
         return;