diff --git a/pyproject.toml b/pyproject.toml
index 06dbae8a..eb9667c7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ build-backend = "poetry.masonry.api"
 
 [tool.poetry]
 name = "together"
-version = "1.3.10"
+version = "1.3.11"
 authors = [
     "Together AI <support@together.ai>"
 ]
diff --git a/src/together/utils/files.py b/src/together/utils/files.py
index 6c5892f1..cc39fca0 100644
--- a/src/together/utils/files.py
+++ b/src/together/utils/files.py
@@ -177,6 +177,14 @@ def _check_jsonl(file: Path) -> Dict[str, Any]:
                             error_source="key_value",
                         )
 
+                    if len(json_line[message_column]) == 0:
+                        raise InvalidFileFormatError(
+                            message=f"Invalid format on line {idx + 1} of the input file. "
+                            f"Expected a non-empty list of messages. Found empty list",
+                            line_number=idx + 1,
+                            error_source="key_value",
+                        )
+
                     for turn_id, turn in enumerate(json_line[message_column]):
                         if not isinstance(turn, dict):
                             raise InvalidFileFormatError(
diff --git a/tests/unit/test_files_checks.py b/tests/unit/test_files_checks.py
index 7abae4ad..37c698d2 100644
--- a/tests/unit/test_files_checks.py
+++ b/tests/unit/test_files_checks.py
@@ -290,3 +290,16 @@ def test_check_jsonl_extra_column(tmp_path: Path):
     report = check_file(file)
     assert not report["is_check_passed"]
     assert "Found extra column" in report["message"]
+
+
+def test_check_jsonl_empty_messages(tmp_path: Path):
+    file = tmp_path / "empty_messages.jsonl"
+    content = [{"messages": []}]
+    with file.open("w") as f:
+        f.write("\n".join(json.dumps(item) for item in content))
+
+    report = check_file(file)
+    assert not report["is_check_passed"]
+    assert (
+        "Expected a non-empty list of messages. Found empty list" in report["message"]
+    )