diff --git a/src/wmspec.c b/src/wmspec.c
index 26f4a5a6..2d9b4611 100644
--- a/src/wmspec.c
+++ b/src/wmspec.c
@@ -408,6 +408,8 @@ static RImage *makeRImageFromARGBData(unsigned long *data)
 		return NULL;
 
 	image = RCreateImage(width, height, True);
+	if (!image)
+		return NULL;
 
 	for (imgdata = image->data, i = 2; i < size + 2; i++, imgdata += 4) {
 		pixel = data[i];