Issue Resolved
I have resolved the issue by deleting the cameras that were associated with the skeletal mesh I attached them to. Those were camera rigs I used to transfer the camera animation from Maya to Unreal. Apparently I keyed some of those cameras which caused the Matinee to crash.
I found out the root of the issue when I was recreating a Matinee sequence and the same crashing occurred to that particular Matinee so I started off by deleting the skeletal meshes holding the camera which didn’t work so I tried to delete the cameras instead.