diff --git a/ext/standard/tests/streams/gh19705.phpt b/ext/standard/tests/streams/gh19705.phpt
new file mode 100644
index 000000000000..d34cfc700596
--- /dev/null
+++ b/ext/standard/tests/streams/gh19705.phpt
@@ -0,0 +1,11 @@
+--TEST--
+GH-19705 segmentation fault with non writable stream at stream_filter_append call.
+--EXTENSIONS--
+zlib
+--FILE--
+<?php
+$fh = fopen('data://text/plain,', 'w+',);
+var_dump(stream_filter_append($fh, 'zlib.deflate',STREAM_FILTER_WRITE));
+?>
+--EXPECTF--
+resource(%d) of type (stream filter)
diff --git a/main/streams/streams.c b/main/streams/streams.c
index 1471c98558e1..fbe689b54153 100644
--- a/main/streams/streams.c
+++ b/main/streams/streams.c
@@ -1280,7 +1280,7 @@ PHPAPI int _php_stream_flush(php_stream *stream, int closing)
 {
 	int ret = 0;
 
-	if (stream->writefilters.head) {
+	if (stream->writefilters.head && stream->ops->write) {
 		_php_stream_write_filtered(stream, NULL, 0, closing ? PSFS_FLAG_FLUSH_CLOSE : PSFS_FLAG_FLUSH_INC );
 	}