diff --git a/apps/graph/graph/calculation_graph_controller.cpp b/apps/graph/graph/calculation_graph_controller.cpp
index 0f745fe7f..1171157df 100644
--- a/apps/graph/graph/calculation_graph_controller.cpp
+++ b/apps/graph/graph/calculation_graph_controller.cpp
@@ -23,7 +23,7 @@ View * CalculationGraphController::view() {
 }
 
 void CalculationGraphController::viewWillAppear() {
-  assert(m_record.isNull());
+  assert(!m_record.isNull());
   Expression::Coordinate2D pointOfInterest = computeNewPointOfInteresetFromAbscissa(m_graphRange->xMin(), 1);
   if (std::isnan(pointOfInterest.abscissa)) {
     m_isActive = false;