Cannot enter multiple sprint numbers with spaces

When I tried to add additional sprint ID (233) in jira issue properties, I got next error:

Sprint id must be a number: 233

I figured out, that adding multiple sprint IDs without spaces (for example: "123,124,127") works well, but if you trying to add sprint ID with spaces (for example: "123,124, 127") – you will get this error.
Can you please fix this (by trimming spaces while applying issue properties)?

We are using Jira 6.0.6 + Jira Agile 6.3.3