diff --git a/pre_commit_nb/base64_to_external_storage.py b/pre_commit_nb/base64_to_external_storage.py
index abab970..a187308 100644
--- a/pre_commit_nb/base64_to_external_storage.py
+++ b/pre_commit_nb/base64_to_external_storage.py
@@ -2,6 +2,7 @@
 import mimetypes
 import os
 import re
+import traceback
 import urllib.request
 from typing import Optional, Sequence
 from urllib.parse import urlparse
@@ -116,16 +117,23 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
         help='Forces `git commit` to go through even when there were some files modified with this git hook. Default behavior for `pre-commit` manager is to abort commit if git hook made any changes to staged files')  # NOQA E501
     args = parser.parse_args(argv)
 
+    if not os.path.exists(args.dotenv_file_path):
+        print("WARNING! Couldn't find dotenv file under specified path: " + args.dotenv_file_path)  # NOQA E501
     load_dotenv(verbose=True, override=True, dotenv_path=args.dotenv_file_path)
 
     az_blob_container_url = os.environ.get("AZ_BLOB_CONTAINER_URL")
     az_blob_container_sas_token_upload = os.environ.get("AZ_BLOB_CONTAINER_SAS_TOKEN_UPLOAD")  # NOQA E501
     az_blob_container_sas_token_download = os.environ.get("AZ_BLOB_CONTAINER_SAS_TOKEN_DOWNLOAD")  # NOQA E501
-    az_blob_container_url, az_blob_container_sas_token_upload, az_blob_container_sas_token_download = validate_env_vars(  # NOQA E501
-        az_blob_container_url, az_blob_container_sas_token_upload, az_blob_container_sas_token_download)  # NOQA E501
 
     retv = 0
 
+    try:
+        az_blob_container_url, az_blob_container_sas_token_upload, az_blob_container_sas_token_download = validate_env_vars(  # NOQA E501
+            az_blob_container_url, az_blob_container_sas_token_upload, az_blob_container_sas_token_download)  # NOQA E501
+    except Exception:
+        traceback.print_exc()
+        return 1
+
     for filename in args.filenames:
         return_value = process_nb(
             filename=filename,
diff --git a/setup.py b/setup.py
index db839a8..29b491a 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(
     name="pre_commit_nb",
-    version="0.2.4a4",
+    version="0.2.4a5",
     description="Set of git pre-commit hooks for Jupyter Notebooks compatible with https://pre-commit.com/ framework",  # NOQA E501
     long_description=long_description,
     long_description_content_type="text/markdown",  # This is important!