diff --git a/modules/loaders/gguf_support.py b/modules/loaders/gguf_support.py
index d4107971..a95e20eb 100644
--- a/modules/loaders/gguf_support.py
+++ b/modules/loaders/gguf_support.py
@@ -256,6 +256,10 @@ def _load(path: str, clip: bool) -> tuple[dict, dict, str]:
             sd = read(path)
             if isinstance(sd, tuple):        # newer ComfyUI-GGUF: (state dict, {arch_str, metadata})
                 sd = sd[0]
+            if clip and any(str(k).startswith(("blk.", "v.", "mm.", "token_embd")) for k in sd):
+                # llama.cpp's own names came back unmapped: a vision projector (mmproj) or an architecture the pack
+                # let through without a name map. Built as a text encoder it would be an empty shell that "loaded".
+                raise ValueError("this .gguf is not a text encoder ComfyUI-GGUF can map (an mmproj / vision file, or an unsupported architecture)")
             options = {}
             ggml_ops = getattr(ops, "GGMLOps", None)
             if ggml_ops is not None:
@@ -263,6 +267,8 @@ def _load(path: str, clip: bool) -> tuple[dict, dict, str]:
             return sd, options, f"gguf: quantized (ComfyUI-GGUF at {os.path.basename(d)})"
         except Exception as e:  # noqa: BLE001 -- any refusal is a reason to fall back
             if importlib.util.find_spec("gguf") is None:
+                if isinstance(e, ModuleNotFoundError) and "gguf" in str(e):
+                    raise RuntimeError(UNAVAILABLE) from e        # the pack is here, the library it imports is not
                 raise
             if clip:
                 # The native reader keeps llama.cpp's tensor names; only the pack maps them back to a text encoder's.
diff --git a/modules/loaders/tests/test_gguf_support.py b/modules/loaders/tests/test_gguf_support.py
index 1495af38..8f119b68 100644
--- a/modules/loaders/tests/test_gguf_support.py
+++ b/modules/loaders/tests/test_gguf_support.py
@@ -286,3 +286,28 @@ def test_a_text_encoder_gguf_with_no_backend_says_the_pack_not_pip(monkeypatch):
     monkeypatch.setattr(gguf_support, "backend", lambda: None)
     with pytest.raises(RuntimeError, match="ComfyUI-GGUF"):
         gguf_support.load_clip_state_dict("/x.gguf")
+
+
+def _pack(tmp_path, body):
+    d = tmp_path / "pack"
+    d.mkdir()
+    (d / "ops.py").write_text("class GGMLOps:\n    pass\n")
+    (d / "loader.py").write_text(body)
+    return d
+
+
+def test_a_vision_projector_gguf_the_pack_lets_through_is_refused_as_a_text_encoder(tmp_path, monkeypatch):
+    d = _pack(tmp_path, "def gguf_clip_loader(path):\n    return {'v.blk.0.attn_q.weight': 1}\n")
+    monkeypatch.setattr(gguf_support, "_pack_dir", lambda: str(d))
+    monkeypatch.delitem(sys.modules, gguf_support._PKG_NAME, raising=False)
+    with pytest.raises(RuntimeError, match="not supported"):
+        gguf_support.load_clip_state_dict("/mmproj.gguf")
+
+
+def test_a_pack_whose_gguf_library_is_missing_says_how_to_fix_it_not_an_import_error(tmp_path, monkeypatch):
+    d = _pack(tmp_path, "import gguf_missing_for_this_test\ndef gguf_sd_loader(path):\n    return {}\n")
+    monkeypatch.setattr(gguf_support, "_pack_dir", lambda: str(d))
+    monkeypatch.delitem(sys.modules, gguf_support._PKG_NAME, raising=False)
+    monkeypatch.setattr(gguf_support.importlib.util, "find_spec", lambda name: None)
+    with pytest.raises(RuntimeError):
+        gguf_support.load_state_dict("/x.gguf")