Creating multiple stShipwreck1 stations at the same spot causes the game to freeze.

Code used was:
(sysCreateStation stationType (sysVectorPolarOffset gPlayership 45 15))
or
(sysCreateStation stationType (objGetPos gPlayership))
without moving the playership.

Further investigation revealed more stations which will freeze the game.
stShipwreck1
stShipwreck2
stShipwreck3
stSealedCargoContainer
stRadioactiveShipwreck
stSalvagerEncounter

It is sometimes necessary to create a third station at the same position to get the game to freeze but it always happens.

Combinations of these stations will also cause the game to freeze, eg stShipwreck2 then stRadioactiveShipwreck.

Multiple Startons or Commonwealth Fortresses created in the same spot do not freeze the game.