diff --git a/tests/default/DbaInferenceTest.php b/tests/default/DbaInferenceTest.php
index bff723c81..76163f646 100644
--- a/tests/default/DbaInferenceTest.php
+++ b/tests/default/DbaInferenceTest.php
@@ -65,6 +65,7 @@ public function dataFileAsserts(): iterable
         yield from $this->gatherAssertTypes(__DIR__.'/data/pdo-default-fetch-types.php');
         yield from $this->gatherAssertTypes(__DIR__.'/data/bug372.php');
         yield from $this->gatherAssertTypes(__DIR__.'/data/inference-placeholder.php');
+        yield from $this->gatherAssertTypes(__DIR__.'/data/bug394.php');
     }
 
     /**
diff --git a/tests/default/data/bug394.php b/tests/default/data/bug394.php
new file mode 100644
index 000000000..d90a04d31
--- /dev/null
+++ b/tests/default/data/bug394.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Bug394;
+
+class X {
+    /**
+     * @var \Doctrine\DBAL\Connection
+     */
+    private $conn;
+
+    public function bug394(mixed $conditionId)
+    {
+        if ($conditionId !== null) {
+            $query = 'SELECT email, adaid FROM ada WHERE adaid = ?';
+            $fetchResult = $this->conn->fetchAssociative($query, [$conditionId]);
+            assertType('array{email: string, adaid: int<-32768, 32767>}|false', $fetchResult);
+        }
+    }
+}