diff --git a/src/src/Rendering/Measure/OpenPolyAnnotationActor.cpp b/src/src/Rendering/Measure/OpenPolyAnnotationActor.cpp
index 11ff37b..7533e35 100644
--- a/src/src/Rendering/Measure/OpenPolyAnnotationActor.cpp
+++ b/src/src/Rendering/Measure/OpenPolyAnnotationActor.cpp
@@ -176,6 +176,7 @@ void OpenPolyAnnotationActor::UpdatePerimeterAndAreaText()
 {
     if (text)
     {
+        if (renderPoints->GetNumberOfPoints()<1) return;
         double *rp = renderPoints->GetPoint(0);
         text->SetDisplayPosition(rp[0] + 10, rp[1] - 20);
         double distance = 0.0;