Similar to the bug where riding horses in a server gives you an NPE, the same thing happens to minecarts. I'm sure the issue is caused by the same thing as with horses also, and it probably happens with pigs as well, but I thought it would be helpful to report this too.
MC-14227
Null Pointer Exception When Attempting to Ride a Minecart
Resolved
Duplicate
0
Platypus
(Unassigned)
Unconfirmed
NPE, horse, minecart, pig
Snapshot 13w16a
Retrieved
Duplicate of MC-13623, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.