I have this weird behavior. In my developing computer all works flawlessly, while in testing server on several pages it throws this error./var/www/html/models/EventsPricesList.php(2765): Call to a member function setQueryStringValue() on null
(on other pages happens on searchExpression() or getDetailFilter() eg. /var/www/html/models/CyclesView.php(842): Call to a member function getDetailFilter() on null )The debug:
#0 /var/www/html/models/EventsPricesList.php(712): PHPMaker2024\AfmcNew\EventsPricesList->setupMasterParms()
#1 /var/www/html/controllers/ControllerBase.php(34): PHPMaker2024\AfmcNew\EventsPricesList->run()
#2 /var/www/html/controllers/EventsPricesController.php(22): PHPMaker2024\AfmcNew\ControllerBase->runPage()
#3 /var/www/html/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(38): PHPMaker2024\AfmcNew\EventsPricesController->list()
...
The MailingAutomationList.php file:
// View row ======> ( row 2337)
if ($this->RowType == RowType::VIEW) {
// id
$this->id->ViewValue = $this->id->CurrentValue;
// event_id
$curVal = strval($this->event_id->CurrentValue);
if ($curVal != "") {
$this->event_id->ViewValue = $this->event_id->lookupCacheOption($curVal);
if ($this->event_id->ViewValue === null) { // Lookup from database
$filterWrk = SearchFilter($this->event_id->Lookup->getTable()->Fields["id"]->searchExpression(), "=", $curVal, $this->event_id->Lookup->getTable()->Fields["id"]->searchDataType(), ""); // row 2347
$lookupFilter = $this->event_id->getSelectFilter($this); // PHP
$sqlWrk = $this->event_id->Lookup->getSql(false, $filterWrk, $lookupFilter, $this, true, true);
$conn = Conn();
$config = $conn->getConfiguration();
$config->setResultCache($this->Cache);
$rswrk = $conn->executeCacheQuery($sqlWrk, [], [], $this->CacheProfile)->fetchAll();
$ari = count($rswrk);
if ($ari > 0) { // Lookup values found
$arwrk = $this->event_id->Lookup->renderViewRow($rswrk[0]);
$this->event_id->ViewValue = $this->event_id->displayValue($arwrk);
} else {
$this->event_id->ViewValue = FormatNumber($this->event_id->CurrentValue, $this->event_id->formatPattern());
}
}
} else {
$this->event_id->ViewValue = null;
}
The database is exactly the same and the generated folder was entirely copied everytime.
I think that it also can’t be a permission issue since I am logged in with the hardcoded admin role.This is even more weird since for the same table throws the error on the view page while working ok on edit page.
The only common point I’ve been able to see is that the error comes always from “models” pagesI will really appreciate if someone can enlighten me to find the right way to solve this issue…
Thanks a lot in advance. <3
Thank you both for your answers. 
And in view mode, it counts the total records of all detail records, but if I click the Prices or Mailing tabs:
