In my case it was mentioned in the log.
Look for a line that looks like
"{'Airport': 'EBMB', 'User Pos': (50.89735000171623, 4.472286109681873, 37.5213 m, 1.13707 m, 153.3383832698649, 0.008994005620479584, 0.009075712412595749, -0.0002269755086248086, 1.1887200290679931, 1.0)}"
In this example the conflicting airport was EBMB.