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-rw-r--r--src/libavoid/graph.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libavoid/graph.cpp b/src/libavoid/graph.cpp
index 728f8c085..5b617f123 100644
--- a/src/libavoid/graph.cpp
+++ b/src/libavoid/graph.cpp
@@ -129,7 +129,9 @@ static inline int orthogTurnOrder(const Point& a, const Point& b,
// Note: This method assumes the two Edges that share a common point.
bool EdgeInf::rotationLessThan(const VertInf *lastV, const EdgeInf *rhs) const
{
- if ((_v1 == rhs->_v1) && (_v2 == rhs->_v2))
+ assert(_v1 == rhs->_v1 || _v1 == rhs->_v2 || _v2 == rhs->_v1 || _v2 == rhs->_v2 );
+
+ if ((_v1 == rhs->_v1) && (_v2 == rhs->_v2))
{
// Effectively the same visibility edge, so they are equal.
return false;