From 1a6fdf59ab08018738b4f8d3db444206f08f4c3d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mario=20H=C3=BCttel?= <mario.huettel@gmx.net>
Date: Wed, 1 Aug 2018 12:42:41 +0200
Subject: [PATCH] edit error handling

---
 trigonometric/vector-operations.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/trigonometric/vector-operations.c b/trigonometric/vector-operations.c
index f9e110d..5e8c190 100644
--- a/trigonometric/vector-operations.c
+++ b/trigonometric/vector-operations.c
@@ -50,6 +50,9 @@ void vector_2d_rotate(struct vector_2d *vec, double angle)
 	double sin_val, cos_val;
 	struct vector_2d temp;
 
+	if (!vec)
+		return;
+
 	sin_val = sin(angle);
 	cos_val = cos(angle);