Hello,
I'm trying to save a sprite's state as JSON, and get the following error message. I can reproduce the error only on certain sprites in my project. What would cause the properties of a sprite to be undefined, but only when trying to be read by AsJSON? The sprite's properties are visible in the debugger and otherwise functioning normally.
Update: I've found the issue. If you give a sprite a child during the runtime, and then try to get it's AsJSON value, it throws that error. I can't recreate in stable, only on r287.
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Official bug report: github.com/Scirra/Construct-3-bugs/issues/5545