diff --git a/src/server/scripts/Commands/cs_group.cpp b/src/server/scripts/Commands/cs_group.cpp
index 477eb3649b7..470eb27bad2 100644
--- a/src/server/scripts/Commands/cs_group.cpp
+++ b/src/server/scripts/Commands/cs_group.cpp
@@ -245,7 +245,7 @@ public:
             return false;
         }
 
-        if (!groupSource->IsFull())
+        if (groupSource->IsFull())
         {
             handler->PSendSysMessage(LANG_GROUP_FULL);
             handler->SetSentErrorMessage(true);