diff --git a/ext/intl/locale/locale_methods.c b/ext/intl/locale/locale_methods.c
index d9eb91c659b..a61aebfb367 100644
--- a/ext/intl/locale/locale_methods.c
+++ b/ext/intl/locale/locale_methods.c
@@ -1259,7 +1259,7 @@ PHP_FUNCTION(locale_filter_matches)
 	if( boolCanonical ){
 		/* canonicalize loc_range */
 		can_loc_range=get_icu_value_internal( loc_range , LOC_CANONICALIZE_TAG , &result , 0);
-		if( result ==0) {
+		if( result <=0) {
 			intl_error_set( NULL, status,
 				"locale_filter_matches : unable to canonicalize loc_range" , 0 );
 			RETURN_FALSE;
@@ -1267,7 +1267,7 @@ PHP_FUNCTION(locale_filter_matches)
 
 		/* canonicalize lang_tag */
 		can_lang_tag = get_icu_value_internal( lang_tag , LOC_CANONICALIZE_TAG , &result ,  0);
-		if( result ==0) {
+		if( result <=0) {
 			intl_error_set( NULL, status,
 				"locale_filter_matches : unable to canonicalize lang_tag" , 0 );
 			RETURN_FALSE;
diff --git a/ext/intl/tests/bug78804.phpt b/ext/intl/tests/bug78804.phpt
new file mode 100644
index 00000000000..b0d58ec4309
--- /dev/null
+++ b/ext/intl/tests/bug78804.phpt
@@ -0,0 +1,13 @@
+--TEST--
+Bug #78804: Segmentation fault in Locale::filterMatches
+--FILE--
+<?php
+
+if (Locale::filterMatches('en-US', 'und', true)) {
+    echo 'Matches';
+} else {
+    echo 'Not matches';
+}
+?>
+--EXPECT--
+Not matches
\ No newline at end of file