BUG: Fix Index.putmask not to make stack overflow with an invalid mask

Author: Licht-T

pandas/core/indexes/base.py

@@ -1934,9 +1934,12 @@ def putmask(self, mask, value):
         try:
             np.putmask(values, mask, self._convert_for_op(value))
             return self._shallow_copy(values)
-        except (ValueError, TypeError):
-            # coerces to object
-            return self.astype(object).putmask(mask, value)
+        except (ValueError, TypeError) as err:
+            if self.dtype == np.dtype(object):
+                raise err
+            else:
+                # coerces to object
+                return self.astype(object).putmask(mask, value)
 
     def format(self, name=False, formatter=None, **kwargs):
         """