The first error -> often causes sub-sequential errors.
When getting log-files testers just look at every error and tell the sub-sequencial apart from the cause. If somebody trustworthy (main testers) can reproduce it it is forwarded to schema.
In SMEdit for example no texture files in the expected folder caused a division through zero (no files = 0) which is not allowed.
But there was no error message complaining about missing files. just the source code line number. (SMEdit is open source, SM not, thus it may be hard to figure out what this line means)
Often there are errors which appear in other bugs too.
When you test it with the last versions, then newer you can pindown it to a time when it got introduced (it is easy for schema to check the difference between files and thus find possible cases when the exact version it is introduced is known).
For a bug the most important thing is reproduce-ability.
Peoples often report things and later see that a shop can't check if you are in an allied faction or in the same faction because you have not placed a faction module (I changed my error report then into a miss-leading message issue )
Only knowing or finding the triggering circumstances help testers to reproduce it.
Sometimes it is even hardware or OS (Linux, windows, mac) specific.
This seems to be an issue with that your player's position is recalculated when you leave a ship thus detached from a structure, thus subject of other code parts.
EDIT I could reproduce it
The problem appeared when I were in-between 2 sector borders.
Spawning a core, flying at high speeds and deleting the core while I am in it (BTW: ugly
set my position to where I exited the game.
I reported it here (and said that we both had it), seems to be a new one :
http://bugs.star-made.org/issues/976
Thanks for your help