SIGSEGV on current master when saving with cursor in subscript

[Scott Kostyshak]

To reproduce:

1. Start a new document.
2. Start a math inset, e.g., ctrl + m.
3. Type "x".
4. Press "_" to go into the subscript.
5. Type "i" (so at this step the math will be $x_i$).
6. Save the (new) file.

After saving, I get a SIGSEGV.

Note that to reproduce, after 5, do not move the cursor.

Can anyone reproduce?

Scott
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