This error happens when i place a fence inbetween 2 walls that i have created using Little Tiles.
The fence also becomes a ghost block until the chunk reloads

Running :

• CreativeCore v1.9.83
• LittleTiles v1.5.0-pre189

Pastebin : https://pastebin.com/FGsAC207

This issue has been fixed already, just update CreativeCore and LittleTiles.