diff --git a/src/sdl-instead/game.c b/src/sdl-instead/game.c
index d9a1d4c..f9ce8d9 100644
--- a/src/sdl-instead/game.c
+++ b/src/sdl-instead/game.c
@@ -324,6 +324,11 @@ int game_save(int nr)
 	return -1;
 }
 
+static int inv_enabled(void)
+{
+	return (game_theme.inv_mode != INV_MODE_DISABLED);
+}
+
 int game_apply_theme(void)
 {
 	layout_t lay;
@@ -356,19 +361,23 @@ int game_apply_theme(void)
 	txt_box_set(box, lay);
 	el_set(el_scene, elt_box, game_theme.win_x, 0, box);
 
-	lay = txt_layout(game_theme.inv_font, (game_theme.inv_mode == INV_MODE_HORIZ)?
-			ALIGN_CENTER:ALIGN_LEFT, game_theme.inv_w, game_theme.inv_h);
-	if (!lay)
-		return -1;
-	txt_layout_color(lay, game_theme.icol);
-	txt_layout_link_color(lay, game_theme.ilcol);
-	txt_layout_active_color(lay, game_theme.iacol);
-	box = txt_box(game_theme.inv_w, game_theme.inv_h);
-	if (!box)
-		return -1;
 
-	txt_box_set(box, lay);
-	el_set(el_inv, elt_box, game_theme.inv_x, game_theme.inv_y, box);
+	if (inv_enabled()) {
+		lay = txt_layout(game_theme.inv_font, (game_theme.inv_mode == INV_MODE_HORIZ)?
+			ALIGN_CENTER:ALIGN_LEFT, game_theme.inv_w, game_theme.inv_h);
+		if (!lay)
+			return -1;
+		txt_layout_color(lay, game_theme.icol);
+		txt_layout_link_color(lay, game_theme.ilcol);
+		txt_layout_active_color(lay, game_theme.iacol);
+
+		box = txt_box(game_theme.inv_w, game_theme.inv_h);
+		if (!box)
+			return -1;
+		txt_box_set(box, lay);
+		el_set(el_inv, elt_box, game_theme.inv_x, game_theme.inv_y, box);
+	} else
+		el_set(el_inv, elt_box, game_theme.inv_x, game_theme.inv_y, NULL);
 
 	lay = txt_layout(game_theme.font, ALIGN_CENTER, game_theme.win_w, 0);
 	if (!lay)
@@ -1385,25 +1394,27 @@ int game_cmd(char *cmd)
 	el_draw(el_scene);
 	
 inv:
-	invstr = instead_cmd("inv"); instead_clear();
+	if (inv_enabled()) {
+		int off;
 
-	if (invstr && game_theme.inv_mode == INV_MODE_HORIZ) {
-		invstr = horiz_inv(invstr);
-	}
+		invstr = instead_cmd("inv"); instead_clear();
 
-	do {
-		int off = txt_box_off(el_box(el_inv));
+		if (invstr && game_theme.inv_mode == INV_MODE_HORIZ)
+			invstr = horiz_inv(invstr);
+
+		off = txt_box_off(el_box(el_inv));
 		txt_layout_set(txt_box_layout(el_box(el_inv)), invstr);
 		txt_box_set(el_box(el_inv), txt_box_layout(el_box(el_inv)));
 		txt_box_scroll(el_box(el_inv), off);
-	} while(0);
 	
-	if (invstr)
-		free(invstr);
+		if (invstr)
+			free(invstr);
 	
-	el_clear(el_inv);
-	el_draw(el_inv);
+		el_clear(el_inv);
+		el_draw(el_inv);
+	}
 //	scene_scrollbar();
+
 	if (new_pict || new_place) {
 		img_t offscreen;
 		game_cursor(CURSOR_CLEAR);
@@ -1869,6 +1880,8 @@ static int sel_el = 0;
 
 static void frame_next(void)
 {
+	if (sel_el == el_scene && !inv_enabled())
+		sel_el = el_inv;
 	switch(sel_el) {
 	default:
 	case 0:
@@ -1914,6 +1927,8 @@ static void frame_prev(void)
 		sel_el = el_scene;
 		break;
 	}
+	if (sel_el == el_inv && !inv_enabled())
+		sel_el = el_scene;
 }
 
 static int select_ref(int prev, int last);
diff --git a/src/sdl-instead/graphics.c b/src/sdl-instead/graphics.c
index da2f856..5006462 100644
--- a/src/sdl-instead/graphics.c
+++ b/src/sdl-instead/graphics.c
@@ -1455,6 +1455,8 @@ struct layout *layout_new(fnt_t fn, int w, int h)
 void txt_layout_size(layout_t lay, int *w, int *h)
 {
 	struct layout *layout = (struct layout *)lay;
+	if (!lay)
+		return;
 	if (w)
 		*w = layout->w;
 	if (h)
@@ -1515,9 +1517,11 @@ void txt_layout_free(layout_t lay)
 {
 	struct layout *layout = (struct layout *)lay;
 	_txt_layout_free(lay);
-	cache_free(layout->img_cache);
-	layout->img_cache = NULL;
-	free(lay);
+	if (lay) {
+		cache_free(layout->img_cache);
+		layout->img_cache = NULL;
+		free(lay);
+	}
 }
 
 #define TOKEN_NONE	0
@@ -1788,21 +1792,29 @@ void	layout_debug(struct layout *layout)
 void txt_layout_color(layout_t lay, color_t fg)
 {
 	struct layout *layout = (struct layout*)lay;
+	if (!lay)
+		return;
 	layout->col = fg;
 }
 void txt_layout_link_color(layout_t lay, color_t link)
 {
 	struct layout *layout = (struct layout*)lay;
+	if (!lay)
+		return;
 	layout->lcol = link;	
 }
 void txt_layout_active_color(layout_t lay, color_t link)
 {
 	struct layout *layout = (struct layout*)lay;
+	if (!lay)
+		return;
 	layout->acol = link;	
 }
 void txt_layout_link_style(layout_t lay, int style)
 {
 	struct layout *layout = (struct layout*)lay;
+	if (!lay)
+		return;
 	layout->lstyle = style;	
 }
 
@@ -1886,6 +1898,8 @@ void txt_layout_draw_ex(layout_t lay, struct line *line, int x, int y, int off,
 	struct word *word;
 //	line = layout->lines;
 //	gfx_clip(x, y, layout->w, layout->h);
+	if (!lay)
+		return;
 	if (!line)
 		line = layout->lines;
 	for (; line; line= line->next) {
@@ -1947,7 +1961,7 @@ void txt_box_norm(textbox_t tbox)
 	struct line  *line;
 	int off = box->off;
 
-	if (!box->lay)
+	if (!tbox || !box->lay)
 		return;
 	box->line = box->lay->lines;
 	for (line = box->line; line; line = line->next) {
@@ -1961,12 +1975,16 @@ void txt_box_norm(textbox_t tbox)
 layout_t txt_box_layout(textbox_t tbox)
 {
 	struct textbox *box = (struct textbox *)tbox;
+	if (!box)
+		return NULL;
 	return box->lay;
 }
 
 void txt_box_set(textbox_t tbox, layout_t lay)
 {
 	struct textbox *box = (struct textbox *)tbox;
+	if (!box)
+		return;
 	box->lay = (struct layout*)lay;
 	box->off = 0;
 	if (lay)
@@ -1977,6 +1995,8 @@ void txt_box_set(textbox_t tbox, layout_t lay)
 void txt_box_resize(textbox_t tbox, int w, int h)
 {
 	struct textbox *box = (struct textbox *)tbox;
+	if (!tbox)
+		return;
 	box->w = w;
 	box->h = h;
 	txt_box_norm(tbox);	
@@ -1997,7 +2017,10 @@ void txt_box_scroll_next(textbox_t tbox, int disp)
 {
 	int off, h;
 	struct textbox *box = (struct textbox *)tbox;
-	struct line  *line = box->line;
+	struct line  *line;
+	if (!tbox)
+		return;
+	line = box->line;
 	if (!line)
 		return;
 
@@ -2024,7 +2047,10 @@ void txt_box_scroll_prev(textbox_t tbox, int disp)
 {
 	int off;
 	struct textbox *box = (struct textbox *)tbox;
-	struct line  *line = box->line;
+	struct line  *line;
+	if (!tbox)
+		return;
+	line = box->line;
 	if (!line)
 		return;
 	off = box->off - line->y; /* offset from cur line */
@@ -2044,6 +2070,8 @@ void txt_box_scroll_prev(textbox_t tbox, int disp)
 
 void txt_box_scroll(textbox_t tbox, int disp)
 {
+	if (!tbox)
+		return;
 	if (disp >0)
 		return txt_box_scroll_next(tbox, disp);
 	else if (disp <0)
@@ -2053,7 +2081,10 @@ void txt_box_scroll(textbox_t tbox, int disp)
 void txt_box_next_line(textbox_t tbox)
 {
 	struct textbox *box = (struct textbox *)tbox;
-	struct line  *line = box->line;
+	struct line  *line;
+	if (!box || !box->lay)
+		return;
+	line = box->line;
 	if (!line)
 		return;
 //	txt_box_norm(tbox);		
@@ -2069,7 +2100,10 @@ void txt_box_next_line(textbox_t tbox)
 void txt_box_prev_line(textbox_t tbox)
 {
 	struct textbox *box = (struct textbox *)tbox;
-	struct line  *line = box->line;
+	struct line  *line;
+	if (!box || !box->lay)
+		return;
+	line = box->line;
 	if (!line)
 		return;
 	line = line->prev;
@@ -2083,13 +2117,18 @@ void txt_box_prev_line(textbox_t tbox)
 int	txt_box_off(textbox_t tbox)
 {
 	struct textbox *box = (struct textbox *)tbox;
+	if (!box)
+		return -1;
 	return box->off;
 }
 
 void txt_box_next(textbox_t tbox)
 {
 	struct textbox *box = (struct textbox *)tbox;
-	struct line  *line = box->line;
+	struct line  *line;
+	if (!tbox)
+		return;
+	line = box->line;
 	if (!line)
 		return;
 	for (; line; line = line->next) {
@@ -2105,8 +2144,14 @@ void txt_box_next(textbox_t tbox)
 void txt_box_prev(textbox_t tbox)
 {
 	struct textbox *box = (struct textbox *)tbox;
-	struct layout *lay = box->lay;
-	struct line  *line = box->line;
+	struct layout *lay;
+	struct line  *line;
+	if (!tbox)
+		return;
+	lay = box->lay;
+	if (!lay)
+		return;
+	line = box->line;
 	if (!line)
 		return;
 	for (; line; line = line->prev) {
@@ -2128,7 +2173,8 @@ xref_t txt_box_xrefs(textbox_t tbox)
 	struct xref *xref = NULL;
 	struct word *word = NULL;
 	struct line *line;
-
+	if (!tbox)
+		return NULL;
 	for (line = box->line; line; line = line->next) {
 		if (line->y < box->off)
 			continue; /* too high */
@@ -2150,6 +2196,8 @@ xref_t txt_box_xref(textbox_t tbox, int x, int y)
 	struct xref *xref = NULL;
 	struct word *word = NULL;
 	struct line *line;
+	if (!tbox)
+		return NULL;
 	y += box->off;
 	if (x < 0)
 		return NULL;
@@ -2182,6 +2230,8 @@ xref_t txt_box_xref(textbox_t tbox, int x, int y)
 
 void txt_box_free(textbox_t tbox)
 {
+	if (!tbox)
+		return;
 	free(tbox);
 }
 
@@ -2190,6 +2240,8 @@ img_t txt_box_render(textbox_t tbox)
 	SDL_Surface *old_screen;
 	img_t		dst;
 	struct textbox *box = (struct textbox *)tbox;
+	if (!tbox)
+		return NULL;
 	dst = gfx_new(box->w, box->h);
 	if (!dst)
 		return NULL;
@@ -2207,6 +2259,8 @@ img_t txt_box_render(textbox_t tbox)
 void txt_box_draw(textbox_t tbox, int x, int y)
 {
 	struct textbox *box = (struct textbox *)tbox;
+	if (!tbox)
+		return;
 	gfx_clip(x, y, box->w, box->h);
 //	printf("line: %d\n", box->line->y);
 	txt_layout_draw_ex(box->lay, box->line, x, y - box->off, box->off, box->h, NULL);
@@ -2216,6 +2270,8 @@ void txt_box_draw(textbox_t tbox, int x, int y)
 void txt_box_update_links(textbox_t tbox, int x, int y, clear_fn clear)
 {
 	struct textbox *box = (struct textbox *)tbox;
+	if (!tbox)
+		return;
 	gfx_clip(x, y, box->w, box->h);
 //	printf("line: %d\n", box->line->y);
 	txt_layout_draw_ex(box->lay, box->line, x, y - box->off, box->off, box->h, clear);
@@ -2624,7 +2680,7 @@ xref_t txt_layout_xref(layout_t lay, int x, int y)
 	struct word *word;
 	struct line *line;
 	int i;
-	if (x < 0 || y < 0)
+	if (!lay || x < 0 || y < 0)
 		return NULL;
 	for (xref = layout->xrefs; xref; xref = xref->next) {
 		for (i = 0; i < xref->num; i ++) {
diff --git a/src/sdl-instead/themes.c b/src/sdl-instead/themes.c
index 12d3c3a..0e6884a 100644
--- a/src/sdl-instead/themes.c
+++ b/src/sdl-instead/themes.c
@@ -24,6 +24,8 @@ static int parse_inv_mode(const char *v, void *data)
 		*i = INV_MODE_VERT;	
 	else if (!strcmp(v, "horizontal") || !strcmp(v, "1"))
 		*i = INV_MODE_HORIZ;
+	else if (!strcmp(v, "disabled") || !strcmp(v, "-1"))
+		*i = INV_MODE_DISABLED;
 	else
 		return -1;
 	return 0;	
diff --git a/src/sdl-instead/themes.h b/src/sdl-instead/themes.h
index 1af4ae7..fde1e7d 100644
--- a/src/sdl-instead/themes.h
+++ b/src/sdl-instead/themes.h
@@ -116,6 +116,7 @@ extern int 	theme_img_scale(img_t *p);
 #define GFX_MODE_FIXED 1
 #define GFX_MODE_EMBEDDED 2
 
+#define INV_MODE_DISABLED -1
 #define INV_MODE_VERT 0
 #define INV_MODE_HORIZ 1