Looks like there is another error. When the GM moves a token to an unshared map the player gets the following error:
[3/22/2021 6:16:19 AM] [ERROR] Handler error: [string "scripts/token_height_indication.lua"]:133: attempt to index local 'ctToken' (a nil value)
Logs:
[3/22/2021 6:15:39 AM] RULESET: Dungeons and Dragons (5E) ruleset (v2021-03-09) for Fantasy Grounds
Copyright 2021 Smiteworks USA, LLC
[3/22/2021 6:15:39 AM] RULESET: Core RPG ruleset (v2021-03-16) for Fantasy Grounds
Copyright 2021 Smiteworks USA, LLC
[3/22/2021 6:15:39 AM] EXTENSION: 5E Height Indication by GKEnialb
[3/22/2021 6:15:39 AM] EXTENSION: Roboto Font Extension v1.1
[3/22/2021 6:15:39 AM] MEASURE: LOAD - PART 2 - 2.338483
[3/22/2021 6:15:39 AM] NETWORK SEND FILE REQUEST: BattleMap_Cave01.jpg@FG Battle Maps
[3/22/2021 6:15:39 AM] NETWORK RECV FILE REQUEST: BattleMap_Cave01.jpg@FG Battle Maps
[3/22/2021 6:15:40 AM] NETWORK SEND FILE REQUEST: campaign/portraits/id-00001
[3/22/2021 6:15:40 AM] NETWORK RECV FILE REQUEST: campaign/portraits/id-00001
[3/22/2021 6:15:54 AM] [WARNING] Frame tabs contains out-of-range values in BottomLeft.
[3/22/2021 6:16:09 AM] [WARNING] buttoncontrol: Could not find normal icon () in control (toggle_unmask) in class (imagewindow_toolbar)
[3/22/2021 6:16:19 AM] [WARNING] buttoncontrol: Could not find normal icon () in control (toggle_unmask) in class (imagewindow_toolbar)
[3/22/2021 6:16:19 AM] [ERROR] Handler error: [string "scripts/token_height_indication.lua"]:133: attempt to index local 'ctToken' (a nil value)
[3/22/2021 6:16:19 AM] [ERROR] Handler error: [string "scripts/token_height_indication.lua"]:133: attempt to index local 'ctToken' (a nil value)
[3/22/2021 6:16:19 AM] [ERROR] Handler error: [string "scripts/token_height_indication.lua"]:133: attempt to index local 'ctToken' (a nil value)
screenshot attached.