diff --git a/src/evalfunc.c b/src/evalfunc.c
index 923a750..5b25e97 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -2872,6 +2872,10 @@
     }
     if (++intidx < (int)ARRAY_LENGTH(global_functions))
     {
+	// Skip if the function doesn't have an implementation (feature not
+	// implemented).
+	if (global_functions[intidx].f_func == NULL)
+	    return (char_u *)"";
 	STRCPY(IObuff, global_functions[intidx].f_name);
 	STRCAT(IObuff, "(");
 	if (global_functions[intidx].f_max_argc == 0)
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index a832306..9eca918 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -489,6 +489,12 @@
   let l = getcompletion('paint', 'function')
   call assert_equal([], l)
 
+  if !has('ruby')
+    " global_functions[] has an entry but it doesn't have an implemention
+    let l = getcompletion('ruby', 'function')
+    call assert_equal([], l)
+  endif
+
   let Flambda = {-> 'hello'}
   let l = getcompletion('', 'function')
   let l = filter(l, {i, v -> v =~ 'lambda'})
diff --git a/src/version.c b/src/version.c
index 4c7d896..1cac4b5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1218,
+/**/
     1217,
 /**/
     1216,