Typing a null character causes an error loop

When I tried typing a null character with ctrl caret, it results in an error loop until the app is terminated. I only thought to do this due to a mosh connect error suggesting it to abort a connection attempt.

No source file or test is identified. Start by reproducing the null-character input in Blink on iOS or iPadOS and trace the resulting error loop; done means the input no longer traps the app in repeated errors and the connection-abort flow remains usable.

Written by the indexing model from the issue text.