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An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /var/www/project1/vendor/yiisoft/yii2/web/Response.php on line 414. in /var/www/project1/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /var/www/project1/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /var/www/project1/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send()
#2 /var/www/project1/vendor/yiisoft/yii2/base/ErrorHandler.php(111): yii\web\ErrorHandler->renderException()
#3 /var/www/project1/vendor/yiisoft/yii2/web/DbSession.php(210): yii\base\ErrorHandler->handleException()
#4 [internal function]: yii\web\DbSession->writeSession()
#5 /var/www/project1/vendor/yiisoft/yii2/web/DbSession.php(154): session_write_close()
#6 [internal function]: yii\web\DbSession->close()
#7 {main}
Previous exception:
PDOException: SQLSTATE[25006]: Read only sql transaction: 7 ERROR:  cannot execute INSERT in a read-only transaction in /var/www/project1/vendor/yiisoft/yii2/db/Command.php:1290
Stack trace:
#0 /var/www/project1/vendor/yiisoft/yii2/db/Command.php(1290): PDOStatement->execute()
#1 /var/www/project1/vendor/yiisoft/yii2/db/Command.php(1091): yii\db\Command->internalExecute()
#2 /var/www/project1/vendor/yiisoft/yii2/web/DbSession.php(207): yii\db\Command->execute()
#3 [internal function]: yii\web\DbSession->writeSession()
#4 /var/www/project1/vendor/yiisoft/yii2/web/DbSession.php(154): session_write_close()
#5 [internal function]: yii\web\DbSession->close()
#6 {main}

Next yii\db\Exception: SQLSTATE[25006]: Read only sql transaction: 7 ERROR:  cannot execute INSERT in a read-only transaction
The SQL being executed was: WITH "EXCLUDED" ("user_id", "tier", "data", "id", "expire") AS (VALUES (CAST(NULL AS int4), CAST('frontend' AS bpchar), CAST('__flash|a:0:{}' AS bytea), CAST('0cp7g38ku0f7k0av61jbpl3qfc' AS bpchar), CAST(1774479660 AS int4))), "upsert" AS (UPDATE "pi_sessions" SET "user_id"="EXCLUDED"."user_id", "tier"="EXCLUDED"."tier", "data"="EXCLUDED"."data", "expire"="EXCLUDED"."expire" FROM "EXCLUDED" WHERE "pi_sessions"."id"="EXCLUDED"."id" RETURNING "pi_sessions".*) INSERT INTO "pi_sessions" ("user_id", "tier", "data", "id", "expire") SELECT "user_id", "tier", "data", "id", "expire" FROM "EXCLUDED" WHERE NOT EXISTS (SELECT 1 FROM "upsert" WHERE "upsert"."id"="EXCLUDED"."id") in /var/www/project1/vendor/yiisoft/yii2/db/Schema.php:664
Stack trace:
#0 /var/www/project1/vendor/yiisoft/yii2/db/Command.php(1295): yii\db\Schema->convertException()
#1 /var/www/project1/vendor/yiisoft/yii2/db/Command.php(1091): yii\db\Command->internalExecute()
#2 /var/www/project1/vendor/yiisoft/yii2/web/DbSession.php(207): yii\db\Command->execute()
#3 [internal function]: yii\web\DbSession->writeSession()
#4 /var/www/project1/vendor/yiisoft/yii2/web/DbSession.php(154): session_write_close()
#5 [internal function]: yii\web\DbSession->close()
#6 {main}
Additional Information:
Array
(
    [0] => 25006
    [1] => 7
    [2] => ERROR:  cannot execute INSERT in a read-only transaction
)