diff --git a/Barotrauma/BarotraumaClient/Source/GameSession/GameModes/Tutorials/ContextualTutorial.cs b/Barotrauma/BarotraumaClient/Source/GameSession/GameModes/Tutorials/ContextualTutorial.cs
index 9b60c92aa..292f85b37 100644
--- a/Barotrauma/BarotraumaClient/Source/GameSession/GameModes/Tutorials/ContextualTutorial.cs
+++ b/Barotrauma/BarotraumaClient/Source/GameSession/GameModes/Tutorials/ContextualTutorial.cs
@@ -662,7 +662,7 @@ namespace Barotrauma.Tutorials
                 if (gap.Submarine == null) continue;
                 if (gap.Submarine.IsOutpost) continue;
                 if (gap.Submarine != Submarine.MainSub) continue;
-                if (gap.FlowTargetHull.WaterPercentage <= 0.0f) continue;
+                if (gap.FlowTargetHull == null || gap.FlowTargetHull.WaterPercentage <= 0.0f) continue;
                 return true;
             }