Index: Lib/bdb.py
===================================================================
--- Lib/bdb.py	(wersja 45527)
+++ Lib/bdb.py	(kopia robocza)
@@ -352,6 +352,9 @@
     # a debugger to debug a statement, given as a string.
 
     def run(self, cmd, globals=None, locals=None):
+        if not isinstance(cmd, str):
+            print 'The first argument must be a string'
+            return
         if globals is None:
             import __main__
             globals = __main__.__dict__
@@ -371,6 +374,9 @@
             sys.settrace(None)
 
     def runeval(self, expr, globals=None, locals=None):
+        if not isinstance(cmd, str):
+            print 'The first argument must be a string'
+            return
         if globals is None:
             import __main__
             globals = __main__.__dict__