Unable to import data to new version

Data containing environment variables causes this error:

javax.jdo.JDODataStoreException: Insert request failed: INSERT INTO INSTALLATION (VAR_VALUE,INSTALLATIONTYPE,VAR_NAME,"NAME",MODEL_ENCODING,INSTALLATION_ID) VALUES (?,?,?,?,?,?) NestedThrowables: SQL Exception: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'INSTALLATION_PK' defined on 'INSTALLATION'.