Steps to reproduce error:
1. run XQuartz and open an xterm window
2. run `Xnest -sync -geometry 1024x768 :1 &`
3. run `DISPLAY=:1 xlogo`
Assertion failed: (key->initialized), function dixGetPrivateAddr, file ../include/privates.h, line 122.
Abort trap: 6
The Xnest window dies.
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