diff --git a/ecrire/inc/filtres_images.php b/ecrire/inc/filtres_images.php
index 670967aeaccf0b3bdc257e7aebef42bd8246210d..48086f891796106b82f32f91c569f5e8071211f1 100644
--- a/ecrire/inc/filtres_images.php
+++ b/ecrire/inc/filtres_images.php
@@ -32,7 +32,8 @@ function image_valeurs_trans($img, $effet, $forcer_format = false) {
 		$terminaison_dest = $terminaison;
 		
 		if ($terminaison == "gif") $terminaison_dest = "png";
-	}
+	} else return false;
+	
 	if ($forcer_format) $terminaison_dest = $forcer_format;
 	
 	$term_fonction = $terminaison;