Python Error Not Covered By Parser: (AttributeError: 'Parser' object has no attribute 'returned')

[Tater-Bot]

A Python error occurred when running this Tanzine: https://discordapp.com/channels/731302554784235520/732672011171659828/733076437128446054

Tanzine Code:

@VAR@ x = 0
@FUNC@ <recursion> [@f] {
@RUN@ (<recursion>,@f)
@VAR@ x = @VAR@ x + 1
@RUN@ (/print,@x)
@RETURN@
}

@VAR@ t = @RUN@ (<recursion>,@f)

Python Error:

Traceback (most recent call last):
  File "/root/tanzine-bot/tokens.py", line 421, in Parse
    x = exec(statment)
  File "<string>", line 1
    self.vars['x'] =
                   ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "run.py", line 10, in <module>
    parser.Parse()
  File "/root/tanzine-bot/tokens.py", line 424, in Parse
    if self.returned:
AttributeError: 'Parser' object has no attribute 'returned'