diff --git a/applications/codec/convert.c b/applications/codec/convert.c
index bb5c52bf..beeec151 100644
--- a/applications/codec/convert.c
+++ b/applications/codec/convert.c
@@ -3320,7 +3320,9 @@ opj_image_t *pngtoimage(const char *read_idf, opj_cparameters_t * params)
 	r = image->comps[0].data;
 	g = image->comps[1].data;
 	b = image->comps[2].data;
-	a = image->comps[3].data;
+	if(has_alpha) {
+		a = image->comps[3].data;
+	}
 
 	for(i = 0; i < height; ++i)
    {