Description

WordPress/gutenberg#14815 introduced a crash on paste with error undefined (evaluating activeFormats.length) .

*Note an additional unsolved pasting issue was introduced to gutenberg master, so you must test this issue on gutenberg master commit f92fed7.

To produce:

1. Checkout gutenberg-mobile master, and gutenberg master commit f92fed7.
2. Copy and paste text within a paragraph block.
3. Note the crash with error undefined (evaluating activeFormats.length)