This was fixed recently, but seeing you created it using a buggy version you'll have to either delete the space station folder from the saves folder and recreate it... or you can edit the player.dat NBT file using nbtexplorer. If you're still using 1.5.2, you need to update to version 0.1.36.410 before doing this.
Fixing space station by editing player data file:
- Go into your save folder, look for another folder called DIM_SPACESTATION(number). Remember that number...
- Open up your player.dat file (in the /players/ folder inside the save) using NBTExplorer
- Look for a tag called "spaceStationDimensionID" with value "-1"
- Change the value to whatever number you found in step 1
- Save file and restart client/server