diff --git a/src/core/geometry/qgsgeos.cpp b/src/core/geometry/qgsgeos.cpp
index 8ff1725ac28..5e0c2855783 100644
--- a/src/core/geometry/qgsgeos.cpp
+++ b/src/core/geometry/qgsgeos.cpp
@@ -2510,7 +2510,7 @@ QgsGeometry QgsGeos::mergeLines( QString *errorMsg ) const
 
 QgsGeometry QgsGeos::closestPoint( const QgsGeometry &other, QString *errorMsg ) const
 {
-  if ( !mGeos || isEmpty() || other.isNull() )
+  if ( !mGeos || isEmpty() || other.isEmpty() )
   {
     return QgsGeometry();
   }