You do not lose control of the permanent if it stops being an artifact. The validity of the target is checked only on announcement and resolution of the ability.

Aladdin's ability can take control of more than one artifact, although only one each time the ability is used.

Aladdin : règles, fonctionnement et interactions (MTG)

Aladdin is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

, : Gain control of target artifact for as long as you control this creature.

How it works : Aladdin

Original English text — Wizards of the Coast / Scryfall

#1August 1, 2008· Wizards of the Coast
You do not lose control of the permanent if it stops being an artifact. The validity of the target is checked only on announcement and resolution of the ability.
No other card is named in this ruling.
#2October 4, 2004· Wizards of the Coast
Aladdin's ability can take control of more than one artifact, although only one each time the ability is used.
No other card is named in this ruling.