Chrome DevTools won't let me set breakpoints on certain lines
In the image above, I tried setting breakpoints on every line from line 437 to line 443. However, I cannot set breakpoints on lines 439 and 440. When the function runs, the breakpoints on lines 437, 438, 441, and 442 are ignored. Chrome breaks on line 443. This means that I cannot do some debugging before the first conditional runs.
When I click on lines 439 or 440, the breakpoint appears for half a second and jumps to line 443.
Is this a bug or am I missing something? How do I set a breakpoint at or before line 439?