Hello guys, I'm the developer of Mike Dongles, I have been reported about a crash caused by one of my tools when placed on a Crafting Table. I'm really not sure what is causing it. Maybe you can give me a hint.

This is one of the reports

https://minecraft.curseforge.com/projects/mike-dongles/issues/9

Also here.

http://pastebin.com/ebACWA2A

I couldn't reproduce the crash, so not sure what the problem is. Now I have more information, apparently it happens with already used Crop Dongles, so I'm gonna experiment with that too. But hopefully you know whats going on and help me fix it.

Thanks a lot. Yes I was almost 99% sure it was something I did wrong :D
The repair material, makes sense, I was confuse when creating the materials and I may have derped there and leave the wooden level one without a repair material ;)
Thanks a lot for the feedback.

The item may have a null or invalid repair item.

This is a problem on your side, @MrAmericanMike. It's a relatively simple fix, set your tool's repair material to something nonnull.