Avoid calling rstrip on None

When we receive a SyntaxError, it is not guaranteed to have a token that
includes the physical line causing the issue. If it does not, we now
will avoid trying to determine the number of rows and columns that are
actually there and default to what the error tells us.

Closes #279

1 files changed, 15 insertions, 10 deletions

diff --git a/src/flake8/checker.py b/src/flake8/checker.py
index 32d438c..a9d7cad 100644
--- a/src/flake8/checker.py
+++ b/src/flake8/checker.py
@@ -443,19 +443,24 @@ class FileChecker(object):
             # numbers. We need to decrement the column number by 1 at
             # least.
             column_offset = 1
+            row_offset = 0
             # See also: https://gitlab.com/pycqa/flake8/issues/237
             physical_line = token[-1]
 
-            # NOTE(sigmavirus24): SyntaxErrors also don't exactly have a
-            # "physical" line so much as what was accumulated by the point
-            # tokenizing failed.
-            # See also: https://gitlab.com/pycqa/flake8/issues/237
-            lines = physical_line.rstrip('\n').split('\n')
-            row_offset = len(lines) - 1
-            logical_line = lines[0]
-            logical_line_length = len(logical_line)
-            if column > logical_line_length:
-                column = logical_line_length
+            # NOTE(sigmavirus24): Not all "tokens" have a string as the last
+            # argument. In this event, let's skip trying to find the correct
+            # column and row values.
+            if physical_line is not None:
+                # NOTE(sigmavirus24): SyntaxErrors also don't exactly have a
+                # "physical" line so much as what was accumulated by the point
+                # tokenizing failed.
+                # See also: https://gitlab.com/pycqa/flake8/issues/237
+                lines = physical_line.rstrip('\n').split('\n')
+                row_offset = len(lines) - 1
+                logical_line = lines[0]
+                logical_line_length = len(logical_line)
+                if column > logical_line_length:
+                    column = logical_line_length
             row -= row_offset
             column -= column_offset
         return row, column