Untitled Night at the Museum Spin-off

According to IMDb, a Night at the Museum spin-off film was planned, and would have focus on Jedediah and Octavius. The spin-off was cancelled due to the death of Robin Williams.

Plot
Unknown

Why It Was Cancelled

 * 1) Night at the Museum: Secret of the Tomb was the last installment of the Night at the Museum franchise.
 * 2) Mickey Rooney and Robin Williams (as mentioned before) both passed away in 2014.

Results

 * 1) The film was permanently cancelled.
 * 2) The Night at the Museum film series ended up being a Trilogy.

Trivia

 *    Night at the Museum is getting rebooted for Disney Plus.