Index: pep8-1.7.1/pep8.py
===================================================================
--- pep8-1.7.1/pep8.py
+++ pep8-1.7.1/pep8.py	2019-01-07 11:29:52.016172213 +0100
@@ -190,10 +190,10 @@
     """
     if line_number == total_lines:
         stripped_last_line = physical_line.rstrip()
-        if not stripped_last_line:
+        if physical_line and not stripped_last_line:
             return 0, "W391 blank line at end of file"
         if stripped_last_line == physical_line:
-            return len(physical_line), "W292 no newline at end of file"
+            return len(lines[-1]), "W292 no newline at end of file"
 
 
 def maximum_line_length(physical_line, max_line_length, multiline):