diff --git a/routes/room_page_templates_preview.go b/routes/room_page_templates_preview.go
index f7c9fbe..c6ba230 100644
--- a/routes/room_page_templates_preview.go
+++ b/routes/room_page_templates_preview.go
@@ -59,6 +59,9 @@ func (r *roomTableData) Tangens() float64 {
 	if total == 2 {
 		return 1
 	}
+	if total == 1 {
+		return 500
+	}
 	return math.Tan(math.Pi / float64(r.Total())) // Math.tan(Math.PI/m);
 }