unrecognized/extended character crash

Version: 1.4.3 (0014)

When a prompt has an unrecognized character app crashes with an error message like:
`Backend quit unexpectedly. Could not cast value of type 'NSNull' (0x1f28a5380) to 'NSNumber' (0x1f28a15a8).`

For example, "Twitter’s Slow and Painful End"

Notice the apostrophe in the prompt is ’ (Unicode: U+2019, UTF-8: E2 80 99) rather than ' (Unicode: U+0027, UTF-8: 27).

You can also naturally trigger a similar crash with an emoji 😀 (Unicode: U+1F600, UTF-8: F0 9F 98 80)

Expected Result:

DiffusionBee gracefully handling or ignoring unexpected characters