patch 8.0.0998: strange error when using K while only spaces are selected commit https://github.com/vim/vim/commit/a4f99f5a8b827162a26ca4e4d59f4f224503398a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Aug 26 16:25:32 2017 +0200 patch 8.0.0998: strange error when using K while only spaces are selected Problem: Strange error when using K while only spaces are selected. (Christian J. Robinson) Solution: Check for blank argument.

--- a/src/normal.c
+++ b/src/normal.c
@@ -5648,6 +5648,11 @@ nv_ident(cmdarg_T *cap)
     kp = (*curbuf->b_p_kp == NUL ? p_kp : curbuf->b_p_kp);
     kp_help = (*kp == NUL || STRCMP(kp, ":he") == 0
 						 || STRCMP(kp, ":help") == 0);
+    if (kp_help && *skipwhite(ptr) == NUL)
+    {
+	EMSG(_(e_noident));	 /* found white space only */
+	return;
+    }
     kp_ex = (*kp == ':');
     buflen = (unsigned)(n * 2 + 30 + STRLEN(kp));
     buf = alloc(buflen);