Trace: TypeError: Cannot read properties of null (reading 'morphWeights')

Hello,

I made an object and marked it as an asset in a separate blend file. Now, I’m trying to use it on a new file, but whenever I add it and press run I get this error

Trace: TypeError: Cannot read properties of null (reading ‘morphWeights’)
at iron_object_Uniforms.setObjectConstant (:23980:72)
at iron_object_Uniforms.setObjectConstants (:20512:26)
at iron_object_MeshObject.render (:18321:25)
at iron_RenderPath.submitDraw (:4485:6)
at iron_RenderPath.drawMeshes (:4445:9)
at armory_renderpath_RenderPathCreator.drawMeshes (:1617:45)
at armory_renderpath_RenderPathDeferred.commands (:1704:39)
at armory_renderpath_RenderPathCreator.path.commands (:1787:41)
at iron_RenderPath.renderFrame (:4232:8)
at iron_object_CameraObject.renderFrame (:16446:26)

and a black screen.

What could be causing this ??