Do not specify a variable which is not a query builder

src/Type/Doctrine/QueryBuilder/QueryBuilderTypeSpecifyingExtension.php

@@ -85,6 +85,11 @@ public function specifyTypes(MethodReflection $methodReflection, MethodCall $nod
 			$queryBuilderNode = $queryBuilderNode->var;
 		}
 
+		// If the variable is not a query builder, there is nothing to specify
+		if (!(new ObjectType(QueryBuilder::class))->isSuperTypeOf($scope->getType($queryBuilderNode))->yes()) {
+			return new SpecifiedTypes([]);
+		}
+
 		$resultTypes = [];
 		foreach ($queryBuilderTypes as $queryBuilderType) {
 			$resultTypes[] = $queryBuilderType->append($node);

tests/Type/Doctrine/QueryBuilderTypeSpecifyingExtensionTest.php

@@ -0,0 +1,38 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Type\Doctrine;
+
+use PHPStan\Testing\TypeInferenceTestCase;
+
+class QueryBuilderTypeSpecifyingExtensionTest extends TypeInferenceTestCase
+{
+
+	/**
+	 * @return iterable<mixed>
+	 */
+	public function dataFileAsserts(): iterable
+	{
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-219.php');
+	}
+
+	/**
+	 * @dataProvider dataFileAsserts
+	 * @param string $assertType
+	 * @param string $file
+	 * @param mixed ...$args
+	 */
+	public function testFileAsserts(
+		string $assertType,
+		string $file,
+		...$args
+	): void
+	{
+		$this->assertFileAsserts($assertType, $file, ...$args);
+	}
+
+	public static function getAdditionalConfigFiles(): array
+	{
+		return [__DIR__ . '/../../../extension.neon'];
+	}
+
+}

tests/Type/Doctrine/data/bug-219.php

@@ -0,0 +1,33 @@
+<?php declare(strict_types = 1);
+
+namespace Bug219;
+
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\EntityRepository;
+
+use function PHPStan\Testing\assertType;
+
+class Test
+{
+
+	/** @var EntityManagerInterface */
+	private $entityManager;
+
+	public function __construct(EntityManagerInterface $entityManager)
+	{
+		$this->entityManager = $entityManager;
+	}
+
+	public function getEntityManager(): EntityManagerInterface
+	{
+		return $this->entityManager;
+	}
+
+	public function update(): void
+	{
+		$this->getEntityManager()->getRepository(\stdClass::class)->createQueryBuilder('t')->update();
+
+		assertType('$this(Bug219\Test)', $this);
+	}
+
+}