diff --git a/src/textdatasetcleaner/processors/detect_language.py b/src/textdatasetcleaner/processors/detect_language.py
index be9d342..7286384 100644
--- a/src/textdatasetcleaner/processors/detect_language.py
+++ b/src/textdatasetcleaner/processors/detect_language.py
@@ -48,6 +48,10 @@ def __init__(
     def process_line(self, line: str) -> Optional[str]:
         line_cpy = get_line_piece(line, self.delimiter, self.delimited_position)
 
+        # if piece empty - dont break full line
+        if not line_cpy:
+            return line
+
         # TODO: `line_cpy = line_cpy.lower()` ?
         result = self.ft.predict(line_cpy, k=1)