diff --git a/src/utilities/vector2.hpp b/src/utilities/vector2.hpp
index 2be3d34..57c716c 100644
--- a/src/utilities/vector2.hpp
+++ b/src/utilities/vector2.hpp
@@ -43,6 +43,8 @@ public:
 	}
 	void Normalize() {
 		double l = Length();
+		if (l == 0)
+			throw(std::domain_error("Divide by zero"));
 		x /= l;
 		y /= l;
 	}