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-rw-r--r--scene/resources/surface_tool.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/scene/resources/surface_tool.cpp b/scene/resources/surface_tool.cpp
index 5ce3532d42..47933bd69a 100644
--- a/scene/resources/surface_tool.cpp
+++ b/scene/resources/surface_tool.cpp
@@ -299,6 +299,7 @@ void SurfaceTool::add_triangle_fan(const Vector<Vector3> &p_vertices, const Vect
void SurfaceTool::add_index(int p_index) {
ERR_FAIL_COND(!begun);
+ ERR_FAIL_COND(p_index < 0);
format |= Mesh::ARRAY_FORMAT_INDEX;
index_array.push_back(p_index);