SpawnOverlay returns 0

[swfsql]

The SpawnOverlay function shold return the Uid of the new overlay, but it always returns 0 instead.

For example:

init main
ovrt_sys.js:317 calling spawn_overlay
ovrt_sys.js:320 transform_str: {"posX":0.0,"posY":0.0,"posZ":0.0,"rotX":0.0,"rotY":0.0,"rotZ":0.0,"size":0.25,"opacity":1.0,"curvature":0.0,"framerate":60,"ecoMode":true,"lookHiding":false,"attachedDevice":0,"shouldSave":false}
ovrt_sys.js:323 called spawn_overlay Uid: 0
ovrt_sys.js:323 event overlay_opened. Uid: 932
ovrt_sys.js:323 spawn_overlay_callback. Uid: 932
ovrt_sys.js:317 event api_init

Both the direct callback and the general event callback registered de Uid 932, but spawn_overlay registered de 0 - no matter how many overlay are spawned.