From Access Point to Router via Hub

Is it possible to connect a wireless access point to a router via a
hub?
Unfortunately my router has a single ethernet port, and so does my
wireless access point, so I have connected both to a hub (not a
switch).
To the same hub I have also connected a wired PC.

The wired PC can go outside of the router on the Internet with no
problems.
And also all wireless PC can go outside to the Internet, if the wired
PC is not using the Internet. But as soon asit does, the wireless
access point crashes and all connected wireless clients loose the
connection.

Any idea? Is the Access Point crappy or I have a wrong network
topology?

Thanks!
.

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