diff --git a/sway/desktop/render.c b/sway/desktop/render.c
index 701a9143..32e52849 100644
--- a/sway/desktop/render.c
+++ b/sway/desktop/render.c
@@ -85,7 +85,7 @@ static void adjust_box_to_workspace_offset(struct wlr_box *box,
 	float scroll_percent = output->workspace_scroll.percent;
 
 	int ws_dimen;
-	int *box_coord;
+	int *box_coord = NULL;
 	switch (output->workspace_scroll.direction) {
 	case SWIPE_GESTURE_DIRECTION_NONE:
 		return;
@@ -99,6 +99,10 @@ static void adjust_box_to_workspace_offset(struct wlr_box *box,
 		break;
 	}
 
+	if (box_coord == NULL || ws_dimen == 0) {
+		return;
+	}
+
 	*box_coord -= ws_dimen * scroll_percent;
 	if (!on_focused_workspace) {
 		if (scroll_percent > 0) {
@@ -117,8 +121,8 @@ static void adjust_damage_to_workspace_bounds(pixman_region32_t *damage,
 	float scroll_percent = output->workspace_scroll.percent;
 	int x = 0, y = 0;
 
-	int ws_dimen;
-	int *coord;
+	int ws_dimen = 0;
+	int *coord = NULL;
 	switch (output->workspace_scroll.direction) {
 	case SWIPE_GESTURE_DIRECTION_NONE:
 		return;
@@ -132,6 +136,10 @@ static void adjust_damage_to_workspace_bounds(pixman_region32_t *damage,
 		break;
 	}
 
+	if (coord == NULL || ws_dimen == 0) {
+		return;
+	}
+
 	*coord = round(-ws_dimen * scroll_percent);
 	if (!on_focused_workspace) {
 		if (scroll_percent > 0) {