+1 for this one.
Here is the patch for v1.7.5:
diff -ur franz-josef.DIST/inc/stacks.php franz-josef/inc/stacks.php
--- franz-josef.DIST/inc/stacks.php 2018-04-08 15:14:52.506857096 +0200
+++ franz-josef/inc/stacks.php 2018-04-08 15:33:21.182740583 +0200
@@ -316,6 +316,7 @@
endif;
+if ( ! function_exists( 'franz_stack_posts_meta' ) ) :
/**
* Item meta for Posts stack
*/
@@ -351,4 +352,5 @@
<?php endforeach; ?>
</div>
<?php
-}
\ No newline at end of file
+}
+endif;