diff --git a/phpstan.neon b/phpstan.neon
index 9b77b0f..27ab5f4 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,5 @@
 parameters:
-    level: 7
+    level: 8
     paths:
         - src
     excludePaths:
diff --git a/src/Adapter/Doctrine/ORM/AutomaticQueryBuilder.php b/src/Adapter/Doctrine/ORM/AutomaticQueryBuilder.php
index f387a23..17e76ee 100644
--- a/src/Adapter/Doctrine/ORM/AutomaticQueryBuilder.php
+++ b/src/Adapter/Doctrine/ORM/AutomaticQueryBuilder.php
@@ -118,7 +118,7 @@ private function getIdentifier(ClassMetadata $metadata): string
     {
         $identifiers = $metadata->getIdentifierFieldNames();
 
-        return array_shift($identifiers);
+        return array_shift($identifiers) ?? throw new \LogicException(sprintf('Class %s has no identifiers', $metadata->getName()));
     }
 
     private function setIdentifierFromAssociation(string $association, string $key, ClassMetadata $metadata): ClassMetadata
diff --git a/src/Adapter/Doctrine/ORMAdapter.php b/src/Adapter/Doctrine/ORMAdapter.php
index 8625b1d..24f4eb5 100644
--- a/src/Adapter/Doctrine/ORMAdapter.php
+++ b/src/Adapter/Doctrine/ORMAdapter.php
@@ -154,7 +154,11 @@ protected function getAliases(AdapterQuery $query): array
 
     protected function mapPropertyPath(AdapterQuery $query, AbstractColumn $column): ?string
     {
-        return $this->mapFieldToPropertyPath($column->getField(), $query->get('aliases'));
+        if (null === ($field = $column->getField())) {
+            throw new InvalidConfigurationException(sprintf('Could not automatically map a field for column "%s"', $column->getName()));
+        }
+
+        return $this->mapFieldToPropertyPath($field, $query->get('aliases'));
     }
 
     /**
@@ -169,8 +173,8 @@ protected function getResults(AdapterQuery $query): \Traversable
         // Apply definitive view state for current 'page' of the table
         foreach ($state->getOrderBy() as list($column, $direction)) {
             /** @var AbstractColumn $column */
-            if ($column->isOrderable()) {
-                $builder->addOrderBy($column->getOrderField(), $direction);
+            if ($column->isOrderable() && null !== ($order = $column->getOrderField())) {
+                $builder->addOrderBy($order, $direction);
             }
         }
         if (null !== $state->getLength()) {
diff --git a/src/DataTable.php b/src/DataTable.php
index 5247983..7def904 100644
--- a/src/DataTable.php
+++ b/src/DataTable.php
@@ -165,7 +165,7 @@ public function createAdapter(string $adapter, array $options = []): static
 
     public function getAdapter(): AdapterInterface
     {
-        return $this->adapter;
+        return $this->adapter ?? throw new InvalidConfigurationException('DataTable has no adapter');
     }
 
     public function getColumn(int $index): AbstractColumn
@@ -266,21 +266,21 @@ public function getResponse(): Response
         $state = $this->getState();
 
         // Server side export
-        if (null !== $this->state->getExporterName()) {
+        if (null !== $state->getExporterName()) {
             return $this->exporterManager
                 ->setDataTable($this)
-                ->setExporterName($this->state->getExporterName())
+                ->setExporterName($state->getExporterName())
                 ->getResponse();
         }
 
         $resultSet = $this->getResultSet();
         $response = [
-            'draw' => $this->state->getDraw(),
+            'draw' => $state->getDraw(),
             'recordsTotal' => $resultSet->getTotalRecords(),
             'recordsFiltered' => $resultSet->getTotalDisplayRecords(),
             'data' => iterator_to_array($resultSet->getData()),
         ];
-        if ($this->state->isInitial()) {
+        if ($state->isInitial()) {
             $response['options'] = $this->getInitialResponse();
             $response['template'] = $this->renderer->renderDataTable($this, $this->template, $this->templateParams);
         }
@@ -314,7 +314,7 @@ protected function getResultSet(): ResultSetInterface
             throw new InvalidStateException('No adapter was configured yet to retrieve data with. Call "createAdapter" or "setAdapter" before attempting to return data');
         }
 
-        return $this->adapter->getData($this->state);
+        return $this->adapter->getData($this->getState());
     }
 
     public function getTransformer(): ?callable