diff --git a/privacy_image_cache/privacy_image_cache.php b/privacy_image_cache/privacy_image_cache.php
index 2309ff22..8c68ef9a 100644
--- a/privacy_image_cache/privacy_image_cache.php
+++ b/privacy_image_cache/privacy_image_cache.php
@@ -137,7 +137,7 @@ function privacy_image_cache_init() {
 	}
 
 	// Writing in cachefile
-	if (isset($cachefile) && $cachefile != '')
+	if (isset($cachefile) && ($cachefile != '') and (exif_imagetype($cachefile) > 0))
 		file_put_contents($cachefile, $img_str);
 
 	header("Content-type: $mime");