diff --git a/scripts/odysseus-gallery b/scripts/odysseus-gallery
index ec8160c..ed45831 100755
--- a/scripts/odysseus-gallery
+++ b/scripts/odysseus-gallery
@@ -30,11 +30,19 @@ except ModuleNotFoundError as e:
     sys.exit(2)
 
 
+def _preview_text(value, limit: int = 200) -> str:
+    """Truncated preview tolerant of non-string values. A gallery row whose
+    ``prompt`` is a non-string would crash ``(value or "")[:200]`` with a
+    TypeError; coerce non-strings to ""."""
+    text = value if isinstance(value, str) else ""
+    return text[:limit]
+
+
 def _serialize_image(i: "GalleryImage") -> dict:
     return {
         "id": i.id,
         "filename": i.filename,
-        "prompt": (i.prompt or "")[:200],
+        "prompt": _preview_text(i.prompt),
         "model": i.model or "",
         "size": i.size or "",
         "tags": i.tags or "",
diff --git a/tests/test_gallery_cli_preview.py b/tests/test_gallery_cli_preview.py
new file mode 100644
index 0000000..d928424
--- /dev/null
+++ b/tests/test_gallery_cli_preview.py
@@ -0,0 +1,47 @@
+"""Regression: gallery CLI image serialization must tolerate a non-string prompt.
+
+`_serialize_image` did `(i.prompt or "")[:200]`. A non-string prompt is truthy,
+so `123[:200]` raised TypeError. `_preview_text` coerces non-strings to "".
+"""
+import importlib.machinery
+import importlib.util
+import sys
+import types
+from types import SimpleNamespace
+from pathlib import Path
+from unittest.mock import MagicMock
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def _load_cli(monkeypatch):
+    db = types.ModuleType("core.database")
+    db.SessionLocal = MagicMock()
+    db.GalleryImage = MagicMock()
+    db.GalleryAlbum = MagicMock()
+    monkeypatch.setitem(sys.modules, "core.database", db)
+    path = ROOT / "scripts" / "odysseus-gallery"
+    loader = importlib.machinery.SourceFileLoader("odysseus_gallery_cli", str(path))
+    spec = importlib.util.spec_from_loader(loader.name, loader)
+    module = importlib.util.module_from_spec(spec)
+    loader.exec_module(module)
+    return module
+
+
+def test_preview_text_ignores_non_string(monkeypatch):
+    cli = _load_cli(monkeypatch)
+    assert cli._preview_text(None) == ""
+    assert cli._preview_text(123) == ""
+    assert cli._preview_text("p" * 250) == "p" * 200
+
+
+def test_serialize_image_does_not_crash_on_non_string_prompt(monkeypatch):
+    cli = _load_cli(monkeypatch)
+    img = SimpleNamespace(
+        id="i1", filename="a.png", prompt=123, model=None, size=None, tags=None,
+        favorite=0, album_id=None, session_id=None, width=1, height=1, file_size=1,
+        taken_at=None, camera_make=None, camera_model=None, created_at=None,
+    )
+    out = cli._serialize_image(img)
+    assert out["prompt"] == ""
+    assert out["id"] == "i1"