debug is enough

diff --git a/libasn1fix/asn1fix_class.c b/libasn1fix/asn1fix_class.c
index 05c3227..a764f1a 100644
--- a/libasn1fix/asn1fix_class.c
+++ b/libasn1fix/asn1fix_class.c
@@ -197,7 +197,7 @@
 
 		ofield = asn1f_lookup_child(obj, comp_name);
 		if(ofield == NULL) {
-			FATAL("Cannot find field \"%s\" in \"%s\" at line %d",
+			DEBUG("Cannot find field \"%s\" in \"%s\" at line %d",
 				ref->components[1].name,
 				obj->Identifier,
 				obj->_lineno);