diff --git a/visor.c b/visor.c
index ff036c7..d8dace6 100644
--- a/visor.c
+++ b/visor.c
@@ -342,8 +342,17 @@ void blit_plane(GtkDrawingArea *da, cairo_t *cr, int width, int height, gpointer
 	(void) width;
 	(void) height;
 	(void) data;
-	cairo_set_source_surface(cr, surface, 0, 0);
-	cairo_paint(cr);
+	bool allWritersHadCompleted = true;
+	for (int32_t i = 0; i < thread_count; i++) {
+		if (!threads[i].complete) {
+			allWritersHadCompleted = false;
+			break;
+		}
+	}
+	if (allWritersHadCompleted) {
+		cairo_set_source_surface(cr, surface, 0, 0);
+		cairo_paint(cr);
+	}
 }
 
 void plane_resize(GtkWidget *widget)