diff --git a/services/youtube/youtube_handler.py b/services/youtube/youtube_handler.py
index c775bec..b8f1384 100644
--- a/services/youtube/youtube_handler.py
+++ b/services/youtube/youtube_handler.py
@@ -59,6 +59,8 @@ def init_youtube():
 
 
 def is_youtube_url(url: str) -> bool:
+    if not isinstance(url, str):
+        return False
     return "youtube.com" in url or "youtu.be" in url
 
 
diff --git a/tests/test_is_youtube_url_nonstring_svc.py b/tests/test_is_youtube_url_nonstring_svc.py
new file mode 100644
index 0000000..20af558
--- /dev/null
+++ b/tests/test_is_youtube_url_nonstring_svc.py
@@ -0,0 +1,13 @@
+from services.youtube.youtube_handler import is_youtube_url
+
+
+def test_is_youtube_url_handles_non_string():
+    # `"youtube.com" in url` raises TypeError on a non-string url.
+    assert is_youtube_url(123) is False
+    assert is_youtube_url(None) is False
+    assert is_youtube_url(["https://youtu.be/x"]) is False
+
+
+def test_is_youtube_url_detects_real_urls():
+    assert is_youtube_url("https://www.youtube.com/watch?v=x") is True
+    assert is_youtube_url("https://youtu.be/x") is True