Impersonate and SAML

I was wondering if the impersonate app is incompatible with SSO/SAML. I’ve successfully set up SSO/SAML on a test instance but now using Impersonate results in a server error.

Message : An exception occurred while executing ‘INSERT INTO “oc_authtoken”(“uid”,“login_name”,“name”,“token”,“type”,“remember”,“last_activity”,“last_check”) VALUES(?,?,?,?,?,?,?,?)’ with params [“f.strebel”, “f.strebel”, “Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0”, “d3cf1ca98c9752892b4a9439326f991665aafabe086c34f09def521a95b519ef3b3e16bdb3a10d01a21599837dfe8b3d8dc33420af5af606e95e6d8779c40b8b”, 0, 0, 1527679362, 1527679362]: SQLSTATE[23505]: Unique violation: 7 ERROR: duplicate key value violates unique constraint “authtoken_token_index” DETAIL: Key (token)=(d3cf1ca98c9752892b4a9439326f991665aafabe086c34f09def521a95b519ef3b3e16bdb3a10d01a21599837dfe8b3d8dc33420af5af606e95e6d8779c40b8b) already exists.

I am using 13.0.2.