I think this issue is the same as Kodi v17 Playback crash on "Pause" - #6 by gezb
As detailed in the other thread we have a fix for this which should be released shortly
For now if you are not streaming to OSMC via bluetooth you could disable the BTPlayer add-on go to Settings → Add-on Browser → My Add-ons → Services. Select BTPlayer and disable it (you may need to restart for this to take affect)
This will stop the service that is listening for A2DP streaming but also has some hooks listening for play/pause events that are causing your issue - they are firing when they are not meant to as they are not currently checking if the BTPlayer is active in kodi