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-rw-r--r--riscos/bitmap.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/riscos/bitmap.c b/riscos/bitmap.c
index edfa90c2c..4d8423cdb 100644
--- a/riscos/bitmap.c
+++ b/riscos/bitmap.c
@@ -1057,7 +1057,12 @@ void bitmap_save_file(struct bitmap *bitmap)
os_error *error;
struct bitmap_compressed_header *header;
- assert(bitmap && (bitmap->compressed || bitmap->sprite_area));
+ assert(bitmap);
+
+ if (!bitmap->compressed && !bitmap->sprite_area) {
+ LOG(("bitmap has no data"));
+ return;
+ }
/* unmodified bitmaps will still have their file available */
if ((!(bitmap->state & BITMAP_MODIFIED)) && bitmap->filename[0]) {