diff --git a/aider/models.py b/aider/models.py
index 57d5599c6..a5ea14320 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -1167,7 +1167,10 @@ def fuzzy_match_models(name):
         model = model.lower()
         if attrs.get("mode") != "chat":
             continue
-        provider = (attrs["litellm_provider"] + "/").lower()
+        provider = attrs.get("litellm_provider", "").lower()
+        if not provider:
+            continue
+        provider += "/"
 
         if model.startswith(provider):
             fq_model = model