diff --git a/FerramAerospaceResearch/FARGUI/FARFlightGUI/PhysicsCalcs.cs b/FerramAerospaceResearch/FARGUI/FARFlightGUI/PhysicsCalcs.cs
index b8764f184..6d99b01ee 100644
--- a/FerramAerospaceResearch/FARGUI/FARFlightGUI/PhysicsCalcs.cs
+++ b/FerramAerospaceResearch/FARGUI/FARFlightGUI/PhysicsCalcs.cs
@@ -136,7 +136,7 @@ private void CalculateTotalAeroForce()
                 return;
             foreach (FARAeroPartModule m in _currentAeroModules)
             {
-                if (m is null)
+                if (m is null || m == null)
                     continue;
                 aeroForces.AddForce(m.transform.position, m.totalWorldSpaceAeroForce);
                 aeroForces.AddTorque(m.worldSpaceTorque);