diff --git a/service/openai_api.py b/service/openai_api.py
index 51d61b6..89bdba3 100644
--- a/service/openai_api.py
+++ b/service/openai_api.py
@@ -73,7 +73,7 @@ class OpenAIApi:
                 for line in lines:
                     line = line.strip()
                     # Add a dot at the end of the line if it doesn't end with a punctuation mark
-                    if regex.find(line[-1]) == -1:
+                    if len(line) > 0 and regex.find(line[-1]) == -1:
                         line += "."
                     new_lines.append(line)
                 text = " ".join(new_lines)