Forum search didn't show any results for this error (though, thinking of it, just thought of a second issue that showed up a couple of hours ago; added it at the end).
Error 1414: Value too large or too small for Decimal (literally translated, could be the wrong text error since my computer's in another language) happens after moving forward for any amount of time; the windows shows up a very large number of time and disappears after ~3 seconds of holding Esc. Related to a 0% fuel tanker, which I now can't find anywhere on the map, and can move at the speed of light (damn what a good engine).
When I try to open its fleet on Naval Organisation, 2 errors showed up:
Function #2976: Value too large or too small for Decimal (literally translated, could be the wrong text error since my computer's in another language)
There was a second error window with the same text, but it stopped showing up after I changed the fleet's name (


)
How it began:
Been failing over and over at the correct fleet settings for my tanker, which transports fuel from my gas giant station to Earth. After the thousandth time it stops orbiting the planet and stays there (normally with a full fuel tank; this time, stopped midway when returning to the gas giant due to 0% fuel), I used a tug to move it back to Earth. It refuelled and resupplied there. Can't remember now what orders I gave and what it did afterwards, but the error above started happening. I can't find it anywhere on the map now, its fuel is 0% and its speed in Naval Organisation is at 300. 000 km/s. Whenever I try to open its fleet (I detached it so it's alone), 2 error windows appear, as I described above.
P. S. it's not the first time tankers doing the sorium gas giant -> earth route start flying away at 300. 000km/s for me
EDIT: after changing the fleet's name, I just noticed the Error 1414 windows stopped showing up, but clicking on the Fleet in Naval Organisation still prompts the Function #2976 window
EDIT 2: . dbs below, one a save I had made a few minutes ago, one I saved now
for the new one, when opening Aurora I get "Function #1171: Object can't be converted from DBNull to other types" (translated literally). The Tanker fleet also disappeared, but I can open Aurora.
For the old one, get the same Function 1171 but Aurora's window took about a minute to open (only showed up in alt-tab). I haven't made notes of differences between savefiles, sorry, rookie mistake, but they should be close to 0 and, if there are any differences, they're only related to (things tied to) the passage of time and to the tanker fleet.
old :
https://drive. google. com/open?id=1OHdkWDwyzL3O22QBT6SEvuhMAjCiCNT5
new :
https://drive. google. com/open?id=15Q_adu09Y1OrRBzQ44tIE5XCtynlcMPa