See [0], [1]
[0] https://bugs.archlinux.org/task/79120?project=1&string=ext4magic
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854497#10

--- a/src/block.c
+++ b/src/block.c
@@ -699,7 +699,7 @@ errcode_t local_block_iterate3(ext2_fils
 		mark_extent_block(fs, (char*) inode.i_block);
 
 	extent_errout:
-		local_ext2fs_extent_free(handle);
+		ext2fs_extent_free(handle);
 		ret |= BLOCK_ERROR | BLOCK_ABORT;
 		goto errout;
 	}