diff --git a/Packages/nadena.dev.modular-avatar/Editor/OptimizationPasses/GCGameObjectsPass.cs b/Packages/nadena.dev.modular-avatar/Editor/OptimizationPasses/GCGameObjectsPass.cs
index d5d18f08..61e4d1aa 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/OptimizationPasses/GCGameObjectsPass.cs
+++ b/Packages/nadena.dev.modular-avatar/Editor/OptimizationPasses/GCGameObjectsPass.cs
@@ -50,6 +50,8 @@ namespace nadena.dev.modular_avatar.core.editor
             {
                 foreach (var component in obj.GetComponents<Component>())
                 {
+                    // component is null if script is missing
+                    if (!component) continue;
                     switch (component)
                     {
                         case Transform t: break;
@@ -184,4 +186,4 @@ namespace nadena.dev.modular_avatar.core.editor
             }
         }
     }
-}
\ No newline at end of file
+}