https://issues.dlang.org/show_bug.cgi?id=11594
--- Comment #5 from github-bugzi...@puremagic.com --- Commit pushed to newCTFE at https://github.com/dlang/druntime https://github.com/dlang/druntime/commit/a2ead6dd04efdfeb283b72daf167e85fe8db9c49 Fix issue 11594: Check if the monitor is null in _d_monitorenter --