Merge pull request #186 from Unity-Technologies/UNI-29157-fix-component-update-fail

UNI-29157 add null check for component before copying to it

Author: inwoods

Assets/FbxExporters/Editor/FbxPrefabAutoUpdater.cs

@@ -989,7 +989,15 @@ public HashSet<GameObject> ImplementUpdates(FbxPrefab prefabInstance)
                                 prefabComponent = prefabXfo.gameObject.AddComponent(fbxComponent.t);
                                 Log("created component {0}:{1}", nodeName, fbxComponent.t);
                             }
-
+                            // Check that the component exists before copying to it.
+                            // This happens for Rect Transform components as the fbx
+                            // contains a Transform which it tries to add/update on the
+                            // prefab, but fails because you cannot have both a Transform
+                            // and a Rect Transform
+                            // UNI-29179 TODO: better handling of Rect Transforms
+                            if (!prefabComponent) {
+                                continue;
+                            }
                             // Now set the values.
                             UnityEditor.EditorJsonUtility.FromJsonOverwrite(fbxComponent.jsonValue, prefabComponent);
                         }