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 NULLify current_exception when no longer valid.

--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -1235,7 +1235,7 @@ check_due_timer(void)
 	    if (called_emsg)
 	    {
 		++timer->tr_emsg_count;
-		if (!did_throw_save && current_exception != NULL)
+		if (!did_throw_save && did_throw && current_exception != NULL)
 		    discard_current_exception();
 	    }
 	    did_emsg = did_emsg_save;