NullReferenceException in UnityGLTF.GLTFEditorExporter.ExportPrimitive

[lvault]

I ran into this issue while exporting some GameObjects:

NullReferenceException: Object reference not set to an instance of an object
UnityGLTF.GLTFEditorExporter.ExportPrimitive (UnityEngine.GameObject gameObject) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:530)
UnityGLTF.GLTFEditorExporter.ExportMesh (System.String name, UnityEngine.GameObject[] primitives) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:500)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:404)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:419)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:419)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:419)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:419)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:419)
UnityGLTF.GLTFEditorExporter.ExportNode (UnityEngine.Transform nodeTransform, System.Int32 nodeCount) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:419)
UnityGLTF.GLTFEditorExporter.ExportScene (System.String name, UnityEngine.Transform[] rootObjTransforms) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:356)
UnityGLTF.GLTFEditorExporter.SaveGLTFandBin (System.String path, System.String fileName) (at Assets/PlattarExporter/UnityGLTF/Scripts/GLTFEditorExporter.cs:200)
Plattar.Exporter.GenerateGLTF (UnityEngine.GameObject selectedObject) (at Assets/PlattarExporter/Plattar/Editor/Exporter.cs:243)

After looking at the source file, it looks like GLTFEditorExporter.ExportPrimitive calls GLTFEditorExporter.getMaterials, which is a method that can return null. Though, the returned value isn't checked and thus using it throws the exception.

[hybridherbst]

Should be fixed on the dev branch
and in

• Culmination of two years of fixes, especially for export #644

Would be great if you test that out.