diff --git a/cachier/pickle_core.py b/cachier/pickle_core.py
index f32390e..f7cac16 100644
--- a/cachier/pickle_core.py
+++ b/cachier/pickle_core.py
@@ -152,10 +152,10 @@ class _PickleCore(_BaseCore):
             return key, self._get_cache().get(key, None)
 
     def get_entry(self, args, kwds):
-        key = tuple(self.hash_args(key) for key in args + tuple(sorted(kwds.items())))
+        key = tuple(self._hash_args(key) for key in args + tuple(sorted(kwds.items())))
         return self.get_entry_by_key(key)
 
-    def hash_args(self, value):
+    def _hash_args(self, value):
         try:
             import pandas
             if isinstance(value, pandas.DataFrame):
@@ -165,15 +165,16 @@ class _PickleCore(_BaseCore):
         if hasattr(value, "tobytes"):  # For numpy
             return hash(value.tobytes())
         if hasattr(value, "__iter__"):  # For iterators
-            hash_array = []
-            for elem in value:
-                hash_array.append(value)
-            return tuple(hash_array)
+            if isinstance(value, (list, tuple)):
+                hash_array = []
+                for elem in value:
+                    hash_array.append(self._hash_args(elem))
+                return tuple(hash_array)
         if hasattr(value, "items"):  # For dict
             hash_array = []
             for key, elem in value.items:
                 hash_array.append(key)
-                hash_array.append(elem)
+                hash_array.append(self._hash_args(elem))
             return tuple(hash_array)
         return hash(value)