PrePrepConfig is called during settings migration

TGServerService/Service.cs

@@ -215,6 +215,8 @@ namespace TGServerService
 				var newVersion = Config.SettingsVersion;
 				Config.Upgrade();
 				
+				PrePrepConfig();
+				
 				for (var oldVersion = Config.SettingsVersion; oldVersion < newVersion; ++oldVersion)
 					MigrateSettings(oldVersion);
 
@@ -223,8 +225,8 @@ namespace TGServerService
 				Config.UpgradeRequired = false;
 				Config.Save();
 			}
-
-			PrePrepConfig();
+			else
+				PrePrepConfig();
 		}
 
 		/// <summary>