The thread is quite old but the issue still exists. To fix this you should add the following code to the TLazSynEditLineWrapPlugin:
Thanks, sorry for the delay. Added now. Will merge to fixes-4 asap. (the fix(es) only, not the new feature that were added around it)
Removing the view crashed, when the editor itself was already in destruction. So I added guards for that.
The reason it wasn't there is, that the view may not have been owned by the plugin.
The plugin originally was thought to be able to share that. (see the constructor, there is a search for an existing view).
This will however be removed, it wont be needed any more.