Random error showing an image

[Kees Kling <ckling upcmail nl>]

HI,

in my app I'm loading an pixBuf with the function

image = Gdk::Pixbuf::create_from_file("path and dir of picture);

after the loading I display it with a queue_redraw and in the 
expose_event handler it is displayed with

image->scale_simple(image->get_width() - scaleFactor, 
image->get_height() - scaleFactor,
       
Gdk::INTERP_BILINEAR)->render_to_drawable(win,drawingRegion->get_style()->get_black_gc(),
           0,0,0,0,image->get_width() - scaleFactor, 
image->get_height()- scaleFactor,
           Gdk::RGB_DITHER_NONE,0,0);

Normally this goes well, but sometimes I get the error and crash of the 
app The errmsg is :
GdkPixbuf-CRITICAL **: gdk_pixbuf_scale_simple: assertion `dest_width > 
0' failed.

What is causing this error and how to avoid it??

Thanks
Kees Kling