diff --git a/core/modules/jsonapi/src/Routing/Routes.php b/core/modules/jsonapi/src/Routing/Routes.php
index e592f007..bc355f7c 100644
--- a/core/modules/jsonapi/src/Routing/Routes.php
+++ b/core/modules/jsonapi/src/Routing/Routes.php
@@ -12,6 +12,8 @@
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
+use TypeError;
+use Drupal;
 
 /**
  * Defines dynamic routes.
@@ -215,9 +217,21 @@ protected static function getFileUploadRoutesForResourceType(ResourceType $resou
 
     // File upload routes are only necessary for resource types that have file
     // fields.
-    $has_file_field = array_reduce($resource_type->getRelatableResourceTypes(), function ($carry, array $target_resource_types) {
-      return $carry || static::hasNonInternalFileTargetResourceTypes($target_resource_types);
-    }, FALSE);
+    try {
+      $has_file_field = FALSE;
+      $has_file_field = array_reduce($resource_type->getRelatableResourceTypes(), function ($carry, array $target_resource_types) {
+        return $carry || static::hasNonInternalFileTargetResourceTypes($target_resource_types);
+      }, FALSE);
+    }
+    catch (TypeError $e) {
+      Drupal::messenger()->addMessage(t(
+         'JSONAPI: Fatal error looking internal file target resource types on entity %entity, carry %carry and path %path',
+         [
+           '%entity' => $resource_type->getEntityTypeId(),
+           '%carry' => $resource_type->getBundle(),
+           '%path' => $resource_type->getPath(),
+         ]), 'error');
+    }
     if (!$has_file_field) {
       return $routes;
     }
@@ -336,14 +350,27 @@ protected static function getIndividualRoutesForResourceType(ResourceType $resou
 
       // Only create routes for related routes that target at least one
       // non-internal resource type.
-      if (static::hasNonInternalTargetResourceTypes($target_resource_types)) {
-        // Get an individual resource's related resources.
-        $related_route = new Route("/{$path}/{entity}/{$relationship_field_name}");
-        $related_route->setMethods(['GET']);
-        $related_route->addDefaults([RouteObjectInterface::CONTROLLER_NAME => static::CONTROLLER_SERVICE_NAME . ':getRelated']);
-        $related_route->addDefaults(['related' => $relationship_field_name]);
-        $related_route->setRequirement(RelationshipFieldAccess::ROUTE_REQUIREMENT_KEY, $relationship_field_name);
-        $routes->add(static::getRouteName($resource_type, "$relationship_field_name.related"), $related_route);
+      try {
+        if (static::hasNonInternalTargetResourceTypes($target_resource_types)) {
+          // Get an individual resource's related resources.
+          $related_route = new Route("/{$path}/{entity}/{$relationship_field_name}");
+          $related_route->setMethods(['GET']);
+          $related_route->addDefaults([RouteObjectInterface::CONTROLLER_NAME => static::CONTROLLER_SERVICE_NAME . ':getRelated']);
+          $related_route->addDefaults(['related' => $relationship_field_name]);
+          $related_route->setRequirement(RelationshipFieldAccess::ROUTE_REQUIREMENT_KEY, $relationship_field_name);
+          $routes->add(static::getRouteName($resource_type, "$relationship_field_name.related"), $related_route);
+        }
+      }
+      catch (TypeError $exception) {
+        Drupal::messenger()->addMessage(t(
+          'JSONAPI: Fatal error looking internal resource types on entity %entity, bundle %bundle, field %relationship_field_name and path %path',
+          [
+            '%entity' => $entity_type_id,
+            '%bundle' => $resource_type->getBundle(),
+            '%relationship_field_name' => $relationship_field_name,
+            '%path' => $path,
+          ]), 'error');
+        continue;
       }
     }
 
@@ -431,9 +458,14 @@ protected static function getFileUploadRouteName(ResourceType $resource_type, $r
    *   array; FALSE otherwise.
    */
   protected static function hasNonInternalTargetResourceTypes(array $resource_types) {
-    return array_reduce($resource_types, function ($carry, ResourceType $target) {
-      return $carry || !$target->isInternal();
-    }, FALSE);
+    try {
+      return array_reduce($resource_types, function ($carry, ResourceType $target) {
+        return $carry || !$target->isInternal();
+      }, FALSE);
+    }
+    catch (Exception $e) {
+      throw $e;
+    }
   }
 
   /**
@@ -447,9 +479,14 @@ protected static function hasNonInternalTargetResourceTypes(array $resource_type
    *   given array; FALSE otherwise.
    */
   protected static function hasNonInternalFileTargetResourceTypes(array $resource_types) {
-    return array_reduce($resource_types, function ($carry, ResourceType $target) {
-      return $carry || (!$target->isInternal() && $target->getEntityTypeId() === 'file');
-    }, FALSE);
+    try {
+      return array_reduce($resource_types, function ($carry, ResourceType $target) {
+        return $carry || (!$target->isInternal() && $target->getEntityTypeId() === 'file');
+      }, FALSE);
+    }
+    catch (Exception $e) {
+      throw $e;
+    }
   }
 
   /**