diff --git a/rtgui/cropwindow.cc b/rtgui/cropwindow.cc
index 45372f1f5..6eac5e59d 100644
--- a/rtgui/cropwindow.cc
+++ b/rtgui/cropwindow.cc
@@ -275,6 +275,10 @@ void CropWindow::scroll (int state, GdkScrollDirection direction, int x, int y,
     } else {
         delta = deltaY;
     }
+    if (delta == 0.0 && direction == GDK_SCROLL_SMOOTH) {
+        // sometimes this case happens. To avoid zooming into the wrong direction in this case, we just do nothing
+        return;
+    }
     bool isUp = direction == GDK_SCROLL_UP || (direction == GDK_SCROLL_SMOOTH && delta < 0.0);
     if ((state & GDK_CONTROL_MASK) && onArea(ColorPicker, x, y)) {
         // resizing a color picker