CLI: Fix missing frame key in the page frames hash map

[ayushnirwal]

Description

This PR fixes an intermittently occurring error bug when analyzing sites.

Checklist

• [x] I have thoroughly tested this code to the best of my abilities.
• [x] I have reviewed the code myself before requesting a review.
• ~[ ] This code is covered by unit tests to verify that it works as intended.~
• [x] The QA of this PR is done by a member of the QA team (to be checked by QA).