Effort Value Dojo Legen Town 'Cancel' bug

When EV training in the dojo at Legen Town, everytime you cancel picking a pokemon to train, the game stops/hangs, displays a report (unfortunately i didn't copy it). as soon as that happens you just lose all the training progress if you didn't save before the bug.

I have the same error. Here's the error log:

Exception: RuntimeError
Message: Script error within event 31, map 167 (Legen Town):
Exception: TypeError
Message: (eval):2:in `*'nil can't be coerced into Fixnum
***Full script:
score = pbPunchBag(10)
score = (2*score/5).floor
poke=pbGetPokemon(1)
if score+pbGetTotalEV(poke) >= 510
score -= score+pbGetTotalEV(poke)-510
end
poke.ev[pbGet(2)]+=score
poke.ev[pbGet(2)]=252 if poke.ev[pbGet(2)]>252
poke.calcStats
stat=["HP","Attack","Defense","Speed","Special Attack","Special Defense"]
$game_variables[4]=stat[pbGet(2)]
$game_variables[1]=score
pbCallBub(2,0,2)

Interpreter:243:in `pbExecuteScript'
(eval):2:in `pbExecuteScript'
Interpreter:1600:in `eval'
Interpreter:243:in `pbExecuteScript'
Interpreter:1600:in `command_355'
Interpreter:494:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
* Scene_Map:103:in `update'

Interpreter:276:in `pbExecuteScript'
Interpreter:1600:in `command_355'
Interpreter:494:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
* Scene_Map:103:in `update'
* Scene_Map:101:in `loop'
* Scene_Map:139:in `update'
* Scene_Map:68:in `main'
Exception: RuntimeError
Message: Script error within event 31, map 167 (Legen Town):
Exception: TypeError
Message: (eval):2:in `*'nil can't be coerced into Fixnum
***Full script:
score = pbPunchBag(10)
score = (2*score/5).floor
poke=pbGetPokemon(1)
if score+pbGetTotalEV(poke) >= 510
score -= score+pbGetTotalEV(poke)-510
end
poke.ev[pbGet(2)]+=score
poke.ev[pbGet(2)]=252 if poke.ev[pbGet(2)]>252
poke.calcStats
stat=["HP","Attack","Defense","Speed","Special Attack","Special Defense"]
$game_variables[4]=stat[pbGet(2)]
$game_variables[1]=score
pbCallBub(2,0,2)

Interpreter:243:in `pbExecuteScript'
(eval):2:in `pbExecuteScript'
Interpreter:1600:in `eval'
Interpreter:243:in `pbExecuteScript'
Interpreter:1600:in `command_355'
Interpreter:494:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
* Scene_Map:103:in `update'

Interpreter:276:in `pbExecuteScript'
Interpreter:1600:in `command_355'
Interpreter:494:in `execute_command'
Interpreter:193:in `update'
Interpreter:106:in `loop'
Interpreter:198:in `update'
* Scene_Map:103:in `update'
* Scene_Map:101:in `loop'
* Scene_Map:139:in `update'
* Scene_Map:68:in `main'

This bug has been known since he was implemented. Please read the Sticky Thread before posting new reports. Save often while using him to prevent losing progress.

I just about to say that

Yup, this is a known error and has been posted before. As said, do save often when playing this game since it's still in beta, especially for content from newer updates.