diff --git a/nose/plugins/debug.py b/nose/plugins/debug.py
index 78243e60..d40c1f90 100644
--- a/nose/plugins/debug.py
+++ b/nose/plugins/debug.py
@@ -6,6 +6,9 @@
 
 import pdb
 from nose.plugins.base import Plugin
+from nose.util import isclass
+from nose.plugins.skip import SkipTest
+from nose.plugins.deprecated import DeprecatedTest
 
 class Pdb(Plugin):
     """
@@ -42,9 +45,17 @@ def configure(self, options, conf):
         self.enabled_for_failures = options.debugFailures or options.debugBoth
         self.enabled = self.enabled_for_failures or self.enabled_for_errors
 
+    def _filterError(self, err):
+        if isinstance(err, tuple) and isclass(err[0]):
+            if issubclass(err[0], SkipTest) or issubclass(err[0], DeprecatedTest):
+                return True
+        return False
+
     def addError(self, test, err):
         """Enter pdb if configured to debug errors.
         """
+        if self._filterError(err):
+            return
         if not self.enabled_for_errors:
             return
         self.debug(err)
@@ -52,6 +63,8 @@ def addError(self, test, err):
     def addFailure(self, test, err):
         """Enter pdb if configured to debug failures.
         """
+        if self._filterError(err):
+            return
         if not self.enabled_for_failures:
             return
         self.debug(err)
diff --git a/nose/plugins/errorclass.py b/nose/plugins/errorclass.py
index d1540e00..83b8b730 100644
--- a/nose/plugins/errorclass.py
+++ b/nose/plugins/errorclass.py
@@ -95,7 +95,6 @@
 from nose.pyversion import make_instancemethod
 from nose.plugins.base import Plugin
 from nose.result import TextTestResult
-from nose.util import isclass
 
 class MetaErrorClass(type):
     """Metaclass for ErrorClassPlugins that allows error classes to be
@@ -136,14 +135,6 @@ class ErrorClassPlugin(Plugin):
     score = 1000
     errorClasses = ()
 
-    def addError(self, test, err):
-        err_cls, a, b = err
-        if not isclass(err_cls):
-            return
-        classes = [e[0] for e in self.errorClasses]
-        if filter(lambda c: issubclass(err_cls, c), classes):
-            return True
-
     def prepareTestResult(self, result):
         if not hasattr(result, 'errorClasses'):
             self.patchResult(result)
diff --git a/unit_tests/test_issue_101.py b/unit_tests/test_issue_101.py
deleted file mode 100644
index 44918dcf..00000000
--- a/unit_tests/test_issue_101.py
+++ /dev/null
@@ -1,27 +0,0 @@
-import sys
-import unittest
-import warnings
-from nose.plugins.errorclass import ErrorClass, ErrorClassPlugin
-from nose.exc import SkipTest
-
-class TestErrorClassWithStringException(unittest.TestCase):
-
-    def test_string_exception_not_masked(self):
-        if sys.version_info >= (3,):
-            raise SkipTest("Python 3.x does not support string exceptions")
-
-        class X(Exception):
-            pass
-
-        class EP(ErrorClassPlugin):
-            xes = ErrorClass(X, label='XXX', isfailure=True)
-
-        warnings.filterwarnings(action='ignore', category=DeprecationWarning)
-        try:
-
-            raise "oh no!"
-        except:
-            exc = sys.exc_info()
-        
-        ep = EP()
-        self.assertEqual(ep.addError(None, exc), None)