diff --git a/src/Test/TestLogger.php b/src/Test/TestLogger.php
index d96af29..067a1c6 100644
--- a/src/Test/TestLogger.php
+++ b/src/Test/TestLogger.php
@@ -33,6 +33,8 @@ public function __construct(bool $placeholderInterpolation = false)
      */
     public function log($level, string|\Stringable $message, array $context = []): void
     {
+        assert(isset($context['exception']) ? $context['exception'] instanceof \Throwable : true);
+
         if ($this->placeholderInterpolation === true) {
             $message = $this->interpolate($message, $context);
         }