I was finally able to play my turn but after 3-4 tries only. I didn't try something particular for the last try and somehow it worked.
I didn't get a runtime error this time. I got stuck on the loading page instead. I opened a singleplayer session like Lucifer suggested but that didn't change anything, not immediately at least...
If the error persists, it's better to revert further back to players, like insanetrllogic or me to see if the error can be got rid of.