patch 8.0.0705: crash when there is an error in a timer callback commit https://github.com/vim/vim/commit/cae24be4a808d60313913cc6feea6c2bee2e2a42 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jul 10 22:12:10 2017 +0200 patch 8.0.0705: crash when there is an error in a timer callback Problem: Crash when there is an error in a timer callback. (Aron Griffis, Ozaki Kiichi) Solution: Check did_throw before discarding an exception. NULLify current_exception when no longer valid.