Blueprint Runtime Error: "Accessed None trying to read property"

Development Programming & Scripting
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3

Hello and thank you for your reply! Following your advice, I first placed the isValid? node there as well as the printString on false; then I placed the second printstring in between the set and the spawn actor and got something at last:

PIE: Server logged in
PIE: Play in editor total start time 0.11 seconds.
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Running Timer
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_41.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] IS_NOT_VALID
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_62.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_62.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_10.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_23.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_22.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_10.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_50.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_60.Exit5
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_61.Exit4
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_52.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_31.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_60.Exit4
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_33.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_32.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_61.Exit5
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_23.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_30.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_10.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_25.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_11.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_27.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_37.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_51.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_10.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_61.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_34.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] IS_NOT_VALID
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_30.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_22.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_26.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_24.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_20.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_35.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_11.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_11.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_21.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_36.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064]
PIE: Error: Blueprint Runtime Error: “Accessed None trying to read property SelectedDoorSpawn”. Node: SpawnActor Door Test Graph: EventGraph Function: Execute Ubergraph Dungeon Generator V2 Blueprint: Dungeon_Generator_V2
PIE: Error: Blueprint Runtime Error: “Accessed None trying to read property SelectedDoorSpawn”. Node: SpawnActor Door Test Graph: EventGraph Function: Execute Ubergraph Dungeon Generator V2 Blueprint: Dungeon_Generator_V2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_60.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_12.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon complete!
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_22.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_52.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_60.Exit4
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_10.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_41.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_11.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_27.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_62.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_20.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_37.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064]
PIE: Error: Blueprint Runtime Error: “Accessed None trying to read property SelectedDoorSpawn”. Node: SpawnActor Door Test Graph: EventGraph Function: Execute Ubergraph Dungeon Generator V2 Blueprint: Dungeon_Generator_V2
PIE: Error: Blueprint Runtime Error: “Accessed None trying to read property SelectedDoorSpawn”. Node: SpawnActor Door Test Graph: EventGraph Function: Execute Ubergraph Dungeon Generator V2 Blueprint: Dungeon_Generator_V2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_26.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_32.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_50.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_51.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_10.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_25.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_23.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_61.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_60.Exit5
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_21.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_61.Exit4
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_62.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_10.Exit2
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_24.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_10.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_61.Exit5
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_22.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_23.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_34.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_35.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_11.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_33.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_30.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_12.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_30.Exit1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_11.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_31.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Room_60.Exit3
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon_Corridor_36.Junction1
LogBlueprintUserMessages: [Dungeon_Generator_V2_C_UAID_3C7C3FBA2C4649F901_1554732064] Dungeon complete!

What else could I try to troubleshoot this?