Multiple letters in a cell

[Piratux]

Hello, I've found that it's possible to type multiple letters in a single cell, if there are black cells to the sides.

Reproduction steps:

• Go to https://dylanbeattie.github.io/ipuzzler/
• Type letter A in cell, where there is black cell to the left, and black cell to the right.
• Focus the cell where letter A was just typed.
• On keyboard click left arrow then right arrow.
• Type some letters.
• Notice following error in console:

Similar issue happens, when there are black cells above and below:

• Go to https://dylanbeattie.github.io/ipuzzler/
• Type letter A in cell, where there is black cell above, and black cell below.
• Focus the cell where letter A was just typed.
• On keyboard click up arrow then down arrow.
• Type some letters.