I was trying to reset a variable and Calca crashes every time. My sheet was a lot more complex, but i was able to narrow down recreating the cause.
Example 1
x=a+b
x=> a+b
x=x+1
x=> #will crash on this line every time.
Example 2
a=1
b=1
x=a+b
x=x+1
x=x+2
x=> #will crash on this line every time.

eracer55

Tue, 08 Aug 2017 20:53:23 GMT

Alternatively, this is a good work around.
a=2
b=2
x0=a+b => 4
x0=> 4
x1=x0+1 => 5
x1=> 5
x2=x1+2 => 7
x2=> 7
x0+x1+x2 => 16