diff --git a/filter/ChangeLog b/filter/ChangeLog
index fb65edaf8a..ac3061ca73 100644
--- a/filter/ChangeLog
+++ b/filter/ChangeLog
@@ -7,6 +7,9 @@
 
 2002-04-10  Not Zed  <NotZed@Ximian.com>
 
+	* filter-input.c (validate): Check that there is a value to
+	setup.  Fixes #15470.
+
 	* filtertypes.xml: Added closing ) for "not starts with" subject
 	rule.
 	Added closing ) for all the other broken rules too ...
diff --git a/filter/filter-input.c b/filter/filter-input.c
index 2252f95157..8343abbfa8 100644
--- a/filter/filter-input.c
+++ b/filter/filter-input.c
@@ -176,7 +176,7 @@ validate (FilterElement *fe)
 	FilterInput *fi = (FilterInput *)fe;
 	gboolean valid = TRUE;
 	
-	if (!strcmp (fi->type, "regex")) {
+	if (fi->values && !strcmp (fi->type, "regex")) {
 		regex_t regexpat;        /* regex patern */
 		gint regerr;
 		char *text;