diff --git a/autopep8.py b/autopep8.py
index 8b44a1bb..f906383c 100755
--- a/autopep8.py
+++ b/autopep8.py
@@ -1943,11 +1943,20 @@ def _shorten_line(tokens, source, indentation, indent_word,
     Multiple candidates will be yielded.
 
     """
+    in_string = False
     for (token_type,
          token_string,
          start_offset,
          end_offset) in token_offsets(tokens):
 
+        if IS_SUPPORT_TOKEN_FSTRING:
+            if token_type == tokenize.FSTRING_START:
+                in_string = True
+            elif token_type == tokenize.FSTRING_END:
+                in_string = False
+        if in_string:
+            continue
+
         if (
             token_type == tokenize.COMMENT and
             not is_probably_part_of_multiline(previous_line) and
@@ -4091,7 +4100,7 @@ def read_pyproject_toml(args, parser):
     if config.get("tool", {}).get("autopep8") is None:
         return None
 
-    config = config.get("tool").get("autopep8")
+    config = config.get("tool", {}).get("autopep8")
 
     defaults = {}
     option_list = {o.dest: o.type or type(o.default)
diff --git a/test/test_autopep8.py b/test/test_autopep8.py
index 05c396df..19ff2b15 100755
--- a/test/test_autopep8.py
+++ b/test/test_autopep8.py
@@ -3941,6 +3941,19 @@ def test_e501_with_pep572_assignment_expressions(self):
         with autopep8_context(line, options=['-aa']) as result:
             self.assertEqual(line, result)
 
+    def test_e501_effected_with_fstring(self):
+        line = """\
+def foo():
+    logger.info(f"some string padding some string padding some string padd {somedict['key1']}, more padding more paddin #: {somedict['dictkey2']}")
+"""
+        fixed = """\
+def foo():
+    logger.info(
+        f"some string padding some string padding some string padd {somedict['key1']}, more padding more paddin #: {somedict['dictkey2']}")
+"""
+        with autopep8_context(line) as result:
+            self.assertEqual(fixed, result)
+
     def test_e501_not_effected_with_fstring(self):
         line = """\
 connector = f"socks5://{user}:{password}:{url}:{port}"