stuck, 16 bytes

Result

WA

Duration

491ms

Code [DL]

[[1,2],[3,4]] Ɗ

stdin

89 50 95
77 84 34
07 01 12
49 60 25

stdout

stderr

Traceback (most recent call last):
  File "stuck.py", line 167, in <module>
    main()
  File "stuck.py", line 162, in main
    process(prog, stack=[], t=0, nest=0)
  File "stuck.py", line 55, in process
    stack = plugins[plugin].CMDS[char](stack)
  File "plugins/stuck_base.py", line 128, in pal_
    while len(s)>1:
TypeError: object of type 'NoneType' has no len()

strace