diff --git a/docetl/__init__.py b/docetl/__init__.py
index fb906ecf..8b996359 100644
--- a/docetl/__init__.py
+++ b/docetl/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.1.0"
+__version__ = "0.1.5"
 
 from docetl.runner import DSLRunner
 from docetl.builder import Optimizer
diff --git a/docetl/operations/utils.py b/docetl/operations/utils.py
index 66df5833..30ebffca 100644
--- a/docetl/operations/utils.py
+++ b/docetl/operations/utils.py
@@ -6,6 +6,7 @@
 import threading
 from concurrent.futures import as_completed
 from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Union
+import litellm
 
 from dotenv import load_dotenv
 from frozendict import frozendict
@@ -388,6 +389,11 @@ def call_llm(
     Raises:
         TimeoutError: If the call times out after retrying.
     """
+    if not litellm.supports_function_calling(model):
+        raise ValueError(
+            f"Model {model} does not support function calling (which we use for structured outputs). Please use a different model."
+        )
+
     key = cache_key(model, op_type, messages, output_schema, scratchpad)
 
     max_retries = max_retries_per_timeout
@@ -632,6 +638,11 @@ def call_llm_with_gleaning(
     Returns:
         Tuple[str, float]: A tuple containing the final LLM response and the total cost.
     """
+    if not litellm.supports_function_calling(model):
+        raise ValueError(
+            f"Model {model} does not support function calling (which we use for structured outputs). Please use a different model."
+        )
+
     props = {key: convert_val(value) for key, value in output_schema.items()}
 
     parameters = {"type": "object", "properties": props}
@@ -814,7 +825,7 @@ def parse_llm_response(
                     output_dict = json.loads(tool_call.function.arguments)
                     if "ollama" in response.model:
                         for key, value in output_dict.items():
-                            if isinstance(value, str):
+                            if not isinstance(value, str):
                                 continue
                             try:
                                 output_dict[key] = ast.literal_eval(value)
diff --git a/pyproject.toml b/pyproject.toml
index 0ff20e20..08730e90 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "docetl"
-version = "0.1.4"
+version = "0.1.5"
 description = "ETL with LLM operations."
 authors = ["Shreya Shankar <shreyashankar@berkeley.edu>"]
 license = "MIT"