Whenever I set the cell with 

```
import pdb
pdb.set_trace() 
a = 100

```

inside a jupyter notebook, tracer will get into the `set_trace()` method with `n` instead the next line.

I don't know what to do? How can I get the next line `a = 100`.

To be worse even jump to that line with `j` provides error:

> 
> \*\*\* Jump failed: can only jump from a 'line' trace event 
> 
> 
>