A player on our server decided to put a Market block into a block placer from Cyclic which caused a NullPointerException. After following the stack trace I found that the issue was that Cyclic passes null for the placer that the Market uses to determine its direction. I initially reported this to the Cyclic developer (see Lothrazar/Cyclic#865), but they said that passing null is valid (command blocks pass null also) and to report it here.

Fixed in latest Cyclic version.