After updating the contacts app to 1.5.0 I got a code integrity error:
Signature data not found.
According to https://doc.owncloud.org/server/9.0/admin_manual/issues/code_signing.html#fixing-invalid-code-integrity-messages the error message “EXCEPTION Signature data not found.” is triggered because there is no “signature.json” file in the “appinfo” folder which is indeed missing.
Problem is also reported at https://github.com/nextcloud/contacts/issues/37
Is there any way I can solve the error or do I have to wait for the devs to add the signature?