When a repeating command block is running an execute command, with items a s selector ('execute @e[type=Item] ~ ~ ~ ') and the player uses a fishing rod, the game will crash.

What I expected to happen was...:
Execute the command at the end of the fishing rod

What actually happened was...:
MC crashed

Steps to Reproduce:
1. Create a repeating command block set on always active
2. set a command, which targets items, e.g. 'execute @e[type=Item] ~ ~ ~ say found item'
3. right click the fishing rod