1 files changed, 7 insertions, 3 deletions

diff --git a/src/image.c b/src/image.c
index fb1d825fa54..d1091aec6f3 100644
--- a/src/image.c
+++ b/src/image.c
@@ -1053,9 +1053,13 @@ check_image_size (struct frame *f, int width, int height)
             && height <= XINT (Vmax_image_size));
   else if (FLOATP (Vmax_image_size))
     {
-      xassert (f);
-      w = FRAME_PIXEL_WIDTH (f);
-      h = FRAME_PIXEL_HEIGHT (f);
+      if (f != NULL)
+        {
+          w = FRAME_PIXEL_WIDTH (f);
+          h = FRAME_PIXEL_HEIGHT (f);
+        }
+      else
+        w = h = 1024;  /* Arbitrary size for unknown frame. */
       return (width <= XFLOAT_DATA (Vmax_image_size) * w
               && height <= XFLOAT_DATA (Vmax_image_size) * h);
     }