Catch possible null value error in ModelFilter

src/Filter/ModelFilter.php

@@ -94,7 +94,9 @@ protected function handleMultiple(ProxyQueryInterface $query, string $alias, Fil
             );
         }
 
-        $this->applyWhere($query, $inExpression);
+        if ($inExpression->count() > 0) {
+            $this->applyWhere($query, $inExpression);
+        }
     }
 
     protected function association(ProxyQueryInterface $query, FilterData $data): array
@@ -147,6 +149,10 @@ private function buildInExpression(ProxyQueryInterface $query, string $alias, Fi
         $orX = $queryBuilder->expr()->orX();
 
         foreach ($data->getValue() as $value) {
+            if (!\is_object($value)) {
+                continue;
+            }
+
             $andX = $queryBuilder->expr()->andX();
 
             foreach ($metadata->getIdentifierValues($value) as $fieldName => $identifierValue) {

tests/Filter/ModelFilterTest.php

@@ -53,6 +53,25 @@ public function testFilterArray(): void
         static::assertTrue($filter->isActive());
     }
 
+    public function testFilterNonObject(): void
+    {
+        $filter = new ModelFilter();
+        $filter->initialize('field_name', ['field_options' => ['class' => 'FooBar']]);
+
+        $proxyQuery = new ProxyQuery($this->createQueryBuilderStub());
+
+        $objects = [new \stdClass(), new \stdClass()];
+        $filter->filter($proxyQuery, 'alias', 'field', FilterData::fromArray([
+            'type' => EqualOperatorType::TYPE_EQUAL,
+            'value' => null,
+        ]));
+
+        // the alias is now computer by the entityJoin method
+        self::assertSameQuery([], $proxyQuery);
+        self::assertSameQueryParameters([], $proxyQuery);
+        static::assertFalse($filter->isActive());
+    }
+
     public function testFilterArrayTypeIsNotEqual(): void
     {
         $filter = new ModelFilter();