Texture id is not valid after deleting it from gfx card.
So it should be set to 0
Index: src/com/jme/util/TextureManager.java
===================================================================
--- src/com/jme/util/TextureManager.java (revision 4382)
+++ src/com/jme/util/TextureManager.java (working copy)
@@ -858,6 +858,7 @@
TextureState ts = (TextureState)Renderer.defaultStateList[RenderState.StateType.Texture.ordinal()];
try {
ts.deleteTextureId(tex.getTextureId());
+ tex.setTextureId(0);
} catch (Exception e) {
} // ignore.
}