The Weimar Constitution had two inherent defects which made it unstable:
(i) The system of proportional representation finally led to a rule by coalitions because no single party managed to form the government. This affected the stability of the Weimar Constitution.
(ii) Article 48 gave the President the power to impose emergency, suspend civil rights and rule by decree.
(iii) The Weimar constitution had some inherent defects , which made it unstable and vulnerable to dictatorship.