diff --git a/parso/python/normalizer.py b/parso/python/normalizer.py
index 2c20ef8..4bff296 100644
--- a/parso/python/normalizer.py
+++ b/parso/python/normalizer.py
@@ -442,6 +442,9 @@ class PEP8Normalizer(Normalizer):
     def _check_spacing(self, leaf, info):
         spaces = info.indentation
         prev = self._previous_leaf
+        if prev is not None and prev.type == 'error_leaf' or leaf.type == 'error_leaf':
+            return
+
         if '\t' in spaces:
             self.add_issue(223, 'Used tab to separate tokens', info.indentation_part)
         elif len(spaces) > 1:
@@ -505,7 +508,7 @@ class PEP8Normalizer(Normalizer):
                     message_225 = 'Missing whitespace between tokens'
                     add_not_spaces(225, message_225, info.indentation_part)
                     #print('x', leaf.start_pos, leaf, prev)
-            elif leaf.type =='keyword' or prev.type == 'keyword':
+            elif leaf.type == 'keyword' or prev.type == 'keyword':
                 add_not_spaces(275, 'Missing whitespace around keyword', info.indentation_part)
             else:
                 prev_info = self._previous_whitespace_info
diff --git a/test/normalizer_issue_files/python3.py b/test/normalizer_issue_files/python3.py
new file mode 100644
index 0000000..fde4281
--- /dev/null
+++ b/test/normalizer_issue_files/python3.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+from typing import ClassVar, List
+
+
+# Annotated function (Issue #29)
+def foo(x: int) -> int:
+    return x + 1
+
+
+# Annotated variables #575
+CONST: int = 42
+
+
+class Class:
+    cls_var: ClassVar[str]
+
+    def m(self):
+        xs: List[int] = []