diff --git a/src/core/geometry/qgsrectangle.cpp b/src/core/geometry/qgsrectangle.cpp
index cb6a0e39640b..1e2b5eb7f2bc 100644
--- a/src/core/geometry/qgsrectangle.cpp
+++ b/src/core/geometry/qgsrectangle.cpp
@@ -192,6 +192,8 @@ QgsBox3D QgsRectangle::toBox3d( double zMin, double zMax ) const
 
 QgsRectangle QgsRectangle::snappedToGrid( double spacing ) const
 {
+  if ( isNull() ) return *this;
+
   // helper function
   auto gridifyValue = []( double value, double spacing ) -> double
   {