diff --git a/src/errors.h b/src/errors.h
index c629953..5ca74cc 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -357,6 +357,10 @@
 EXTERN char e_cannot_index_special_variable[]
 	INIT(= N_("E909: Cannot index a special variable"));
 #endif
+EXTERN char_u e_invalid_column_number_nr[]
+	INIT(= N_("E964: Invalid column number: %ld"));
+EXTERN char_u e_invalid_line_number_nr[]
+	INIT(= N_("E966: Invalid line number: %ld"));
 EXTERN char e_command_not_supported_in_vim9_script_missing_var_str[]
 	INIT(= N_("E1100: Command not supported in Vim9 script (missing :var?): %s"));
 #ifdef FEAT_EVAL
diff --git a/src/eval.c b/src/eval.c
index 4e720e8..40a5910 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -5359,8 +5359,9 @@
     name = tv_get_string_chk(varp);
     if (name == NULL)
 	return NULL;
-    if (name[0] == '.')				// cursor
+    if (name[0] == '.' && (!in_vim9script() || name[1] == NUL))
     {
+	// cursor
 	pos = curwin->w_cursor;
 	if (charcol)
 	    pos.col = buf_byteidx_to_charidx(curbuf, pos.lnum, pos.col);
@@ -5376,8 +5377,10 @@
 	    pos.col = buf_byteidx_to_charidx(curbuf, pos.lnum, pos.col);
 	return &pos;
     }
-    if (name[0] == '\'')			// mark
+    if (name[0] == '\'' && (!in_vim9script()
+					|| (name[1] != NUL && name[2] == NUL)))
     {
+	// mark
 	pp = getmark_buf_fnum(curbuf, name[1], FALSE, fnum);
 	if (pp == NULL || pp == (pos_T *)-1 || pp->lnum <= 0)
 	    return NULL;
diff --git a/src/evalbuffer.c b/src/evalbuffer.c
index ba16436..50d26c4 100644
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -151,6 +151,8 @@
     if (buf == NULL || (!is_curbuf && buf->b_ml.ml_mfp == NULL) || lnum < 1)
     {
 	rettv->vval.v_number = 1;	// FAIL
+	if (in_vim9script() && lnum < 1)
+	    semsg(_(e_invalid_line_number_nr), lnum_arg);
 	return;
     }
 
diff --git a/src/indent.c b/src/indent.c
index 51af4df..ed1b799 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -2130,7 +2130,11 @@
     if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
 	rettv->vval.v_number = get_indent_lnum(lnum);
     else
+    {
+	if (in_vim9script())
+	    semsg(_(e_invalid_line_number_nr), lnum);
 	rettv->vval.v_number = -1;
+    }
 }
 
 /*
@@ -2154,6 +2158,8 @@
 	rettv->vval.v_number = get_lisp_indent();
 	curwin->w_cursor = pos;
     }
+    else if (in_vim9script())
+	semsg(_(e_invalid_line_number_nr), lnum);
     else
 #endif
 	rettv->vval.v_number = -1;
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index bc59e3a..d528b71 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -182,6 +182,9 @@
   assert_equal("function('min')", getline(1))
   CheckDefAndScriptFailure(['append([1], "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   CheckDefExecAndScriptFailure(['append("", "x")'], 'E1209: Invalid value for a line number')
+  CheckDefExecAndScriptFailure(['append(".a", "x")'], 'E1209: Invalid value for a line number')
+  CheckDefExecAndScriptFailure(['append("''aa", "x")'], 'E1209: Invalid value for a line number')
+  CheckDefExecAndScriptFailure(['append(-1, "x")'], 'E966: Invalid line number: -1')
   bwipe!
 enddef
 
@@ -199,6 +202,7 @@
   assert_equal(['zero'], getbufline(bnum, 1))
   CheckDefAndScriptFailure(['appendbufline([1], 1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   CheckDefAndScriptFailure(['appendbufline(1, [1], "x")'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 2'])
+  CheckDefExecAndScriptFailure(['appendbufline(' .. bnum .. ', -1, "x")'], 'E966: Invalid line number: -1')
   CheckDefAndScriptFailure(['appendbufline(1, 1, {"a": 10})'], ['E1013: Argument 3: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 3'])
   bnum->bufwinid()->win_gotoid()
   appendbufline('', 0, 'numbers')
@@ -1834,6 +1838,7 @@
   CheckDefAndScriptFailure(['indent([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   CheckDefAndScriptFailure(['indent(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
   CheckDefExecAndScriptFailure(['indent("")'], 'E1209: Invalid value for a line number')
+  CheckDefExecAndScriptFailure(['indent(-1)'], 'E966: Invalid line number: -1')
   assert_equal(0, indent(1))
 enddef
 
@@ -2061,6 +2066,7 @@
 def Test_lispindent()
   CheckDefAndScriptFailure(['lispindent({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<unknown>', 'E1220: String or Number required for argument 1'])
   CheckDefExecAndScriptFailure(['lispindent("")'], 'E1209: Invalid value for a line number')
+  CheckDefExecAndScriptFailure(['lispindent(-1)'], 'E966: Invalid line number: -1')
   assert_equal(0, lispindent(1))
 enddef
 
@@ -3239,6 +3245,7 @@
   assert_equal(['1', '2', '3', 'one', '10', 'two', '11'], getbufline(bnum, 1, '$'))
   CheckDefAndScriptFailure(['setbufline([1], 1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   CheckDefAndScriptFailure(['setbufline(1, [1], "x")'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 2'])
+  CheckDefExecAndScriptFailure(['setbufline(' .. bnum .. ', -1, "x")'], 'E966: Invalid line number: -1')
   CheckDefAndScriptFailure(['setbufline(1, 1, {"a": 10})'], ['E1013: Argument 3: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 3'])
   bnum->bufwinid()->win_gotoid()
   setbufline('', 1, 'nombres')
@@ -3303,6 +3310,7 @@
   assert_equal(['10', 'b', 'c', 'd'], getline(1, '$'))
   CheckDefAndScriptFailure(['setline([1], "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   CheckDefExecAndScriptFailure(['setline("", "x")'], 'E1209: Invalid value for a line number')
+  CheckDefExecAndScriptFailure(['setline(-1, "x")'], 'E966: Invalid line number: -1')
   bw!
 enddef
 
diff --git a/src/textprop.c b/src/textprop.c
index beb82a3..b3dac1f 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -48,8 +48,6 @@
 static int proptype_id = 0;
 
 static char_u e_type_not_exist[] = N_("E971: Property type %s does not exist");
-static char_u e_invalid_col[] = N_("E964: Invalid column number: %ld");
-static char_u e_invalid_lnum[] = N_("E966: Invalid line number: %ld");
 
 /*
  * Find a property type by name, return the hashitem.
@@ -169,7 +167,7 @@
     start_col = tv_get_number(&argvars[1]);
     if (start_col < 1)
     {
-	semsg(_(e_invalid_col), (long)start_col);
+	semsg(_(e_invalid_column_number_nr), (long)start_col);
 	return;
     }
     if (argvars[2].v_type != VAR_DICT)
@@ -213,12 +211,12 @@
 
     if (start_lnum < 1 || start_lnum > buf->b_ml.ml_line_count)
     {
-	semsg(_(e_invalid_lnum), (long)start_lnum);
+	semsg(_(e_invalid_line_number_nr), (long)start_lnum);
 	return FAIL;
     }
     if (end_lnum < start_lnum || end_lnum > buf->b_ml.ml_line_count)
     {
-	semsg(_(e_invalid_lnum), (long)end_lnum);
+	semsg(_(e_invalid_line_number_nr), (long)end_lnum);
 	return FAIL;
     }
 
@@ -243,7 +241,7 @@
 	    col = 1;
 	if (col - 1 > (colnr_T)textlen)
 	{
-	    semsg(_(e_invalid_col), (long)start_col);
+	    semsg(_(e_invalid_column_number_nr), (long)start_col);
 	    return FAIL;
 	}
 
diff --git a/src/version.c b/src/version.c
index 7b454a6..944b1f6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3916,
+/**/
     3915,
 /**/
     3914,