diff --git a/TShockAPI/DB/RegionManager.cs b/TShockAPI/DB/RegionManager.cs
index a9cc2739..a4898b3f 100644
--- a/TShockAPI/DB/RegionManager.cs
+++ b/TShockAPI/DB/RegionManager.cs
@@ -473,27 +473,33 @@ namespace TShockAPI.DB
 			return false;
 		}
 
-		public bool AllowGroup(string regionName, string groups)
+		public bool AllowGroup(string regionName, string groupName)
 		{
-			string groupsNew = "";
+			string mergedGroups = "";
 			using (
-				var reader = database.QueryReader("SELECT * FROM Regions WHERE RegionName=@0 AND WorldID=@1", regionName,
+				var reader = database.QueryReader("SELECT Groups FROM Regions WHERE RegionName=@0 AND WorldID=@1", regionName,
 				                                  Main.worldID.ToString()))
 			{
 				if (reader.Read())
-					groupsNew = reader.Get<string>("Groups");
+					mergedGroups = reader.Get<string>("Groups");
 			}
-			if (groupsNew != "")
-				groupsNew += ",";
-			groupsNew += groups;
 
-			int q = database.Query("UPDATE Regions SET Groups=@0 WHERE RegionName=@1 AND WorldID=@2", groupsNew,
+			string[] groups = mergedGroups.Split(',');
+			// Is the user already allowed to the region?
+			if (groups.Contains(groupName))
+				return true;
+
+			if (mergedGroups != "")
+				mergedGroups += ",";
+			mergedGroups += groupName;
+
+			int q = database.Query("UPDATE Regions SET Groups=@0 WHERE RegionName=@1 AND WorldID=@2", mergedGroups,
 			                       regionName, Main.worldID.ToString());
 
 			Region r = GetRegionByName(regionName);
 			if (r != null)
 			{
-				r.SetAllowedGroups(groupsNew);
+				r.SetAllowedGroups(mergedGroups);
 			}
 			else
 			{