Hello @pmangahis,
in the php error log shows this:
[php7:notice] Slim Application Error:\nType: Illuminate\Database\QueryException\nCode: 23505\nMessage: SQLSTATE[23505]: Unique violation: 7 ERROR: duplicate key value violates unique constraint “chapter_authors_pkey”\nDETAIL: Key (author_id, chapter_id)=(1154, 198) already exists. (SQL: INSERT INTO submission_chapter_authors\n\t\t\t\t(author_id, chapter_id, primary_contact, seq)\n\t\t\t\tVALUES\n\t\t\t\t(1154, 198, 0, 2))\nFile: /var/www/html/omp/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php\nLine: 671\nTrace: #0 /var/www/html/omp/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(631): Illuminate\Database\Connection->runQueryCallback(‘INSERT INTO sub…’, Array, Object(Closure))\n#1 /var/www/html/omp/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(496): Illuminate\Database\Connection->run(‘INSERT INTO sub…’, Array, Object(Closure))\n#2 /var/www/html/omp/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Capsule/Manager.php(200): Illuminate\Database\Connection->affectingStatement(‘INSERT INTO sub…’, Array)\n#3 /var/www/html/omp/lib/pkp/classes/db/DAO.inc.php(138): Illuminate\Database\Capsule\Manager::__callStatic(‘affectingStatem…’, Array)\n#4 /var/www/html/omp/classes/monograph/ChapterAuthorDAO.inc.php(96): DAO->update(‘INSERT INTO sub…’, Array)\n#5 /var/www/html/omp/classes/services/PublicationService.inc.php(335): ChapterAuthorDAO->insertChapterAuthor(1154, 198, false, 2)\n#6 /var/www/html/omp/lib/pkp/classes/plugins/HookRegistry.inc.php(107): APP\Services\PublicationService->versionPublication(‘Publication::ve…’, Array)\n#7 /var/www/html/omp/lib/pkp/classes/services/PKPPublicationService.inc.php(485): HookRegistry::call(‘Publication::ve…’, Array)\n#8 /var/www/html/omp/lib/pkp/api/v1/submissions/PKPSubmissionHandler.inc.php(640): PKP\Services\PKPPublicationService->version(Object(Publication), Object(Request))\n#9 [internal function]: PKPSubmissionHandler->versionPublication(Object(Slim\Http\Request), Object(APIResponse), Array)\n#10 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(40): call_user_func(Array, Object(Slim\Http\Request), Object(APIResponse), Array)\n#11 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/Route.php(281): Slim\Handlers\Strategies\RequestResponse->__invoke(Array, Object(Slim\Http\Request), Object(APIResponse), Array)\n#12 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\Route->__invoke(Object(Slim\Http\Request), Object(APIResponse))\n#13 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/Route.php(268): Slim\Route->callMiddlewareStack(Object(Slim\Http\Request), Object(APIResponse))\n#14 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/App.php(503): Slim\Route->run(Object(Slim\Http\Request), Object(APIResponse))\n#15 /var/www/html/omp/lib/pkp/classes/security/authorization/internal/ApiAuthorizationMiddleware.inc.php(77): Slim\App->__invoke(Object(Slim\Http\Request), Object(APIResponse))\n#16 [internal function]: ApiAuthorizationMiddleware->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Slim\App))\n#17 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(ApiAuthorizationMiddleware), Array)\n#18 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Slim\App))\n#19 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Slim\App))\n#20 /var/www/html/omp/lib/pkp/classes/security/authorization/internal/ApiCsrfMiddleware.inc.php(46): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(APIResponse))\n#21 [internal function]: ApiCsrfMiddleware->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#22 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(ApiCsrfMiddleware), Array)\n#23 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#24 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#25 /var/www/html/omp/lib/pkp/classes/security/authorization/internal/ApiTokenDecodingMiddleware.inc.php(121): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(APIResponse))\n#26 [internal function]: ApiTokenDecodingMiddleware->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#27 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(ApiTokenDecodingMiddleware), Array)\n#28 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#29 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#30 /var/www/html/omp/lib/pkp/classes/handler/APIHandler.inc.php(68): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(APIResponse))\n#31 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#32 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)\n#33 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#34 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#35 /var/www/html/omp/lib/pkp/classes/handler/APIHandler.inc.php(127): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(APIResponse))\n#36 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#37 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)\n#38 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#39 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#40 /var/www/html/omp/lib/pkp/classes/handler/APIHandler.inc.php(132): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(APIResponse))\n#41 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#42 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)\n#43 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#44 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))\n#45 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim\{closure}(Object(Slim\Http\Request), Object(APIResponse))\n#46 /var/www/html/omp/lib/pkp/lib/vendor/slim/slim/Slim/App.php(392): Slim\App->callMiddlewareStack(Object(Slim\Http\Request), Object(APIResponse))\n#47 /var/www/html/omp/lib/pkp/classes/handler/APIHandler.inc.php(124): Slim\App->process(Object(Slim\Http\Request), Object(APIResponse))\n#48 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Obje