diff --git a/build/utils/pytex_file.py b/build/utils/pytex_file.py
index 044b840..47d806a 100644
--- a/build/utils/pytex_file.py
+++ b/build/utils/pytex_file.py
@@ -68,11 +68,12 @@ class TexFileToFormat:
 
     def __format_header(self):
         new_header = []
-        for line in self.current_build_info.header:
-            new_header.append(line.format(
-                source_file=self.src_path.name,
-                latex_file_type='package' if '.pysty' in self.src_path.name else 'class'
-            ))
+        if self.current_build_info.header:
+            for line in self.current_build_info.header:
+                new_header.append(line.format(
+                    source_file=self.src_path.name,
+                    latex_file_type='package' if '.pysty' in self.src_path.name else 'class'
+                ))
         self._header = new_header
 
     def __format(self) -> dict: