diff --git a/src/base_grid.cpp b/src/base_grid.cpp
index 0dc7bc538..51f9a9546 100644
--- a/src/base_grid.cpp
+++ b/src/base_grid.cpp
@@ -499,7 +499,7 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 		CaptureMouse();
 	}
 
-	if (columns[col]->OnMouseEvent(dlg, context, event)) {
+	if (dlg && columns[col]->OnMouseEvent(dlg, context, event)) {
 		return;
 	}