diff --git a/src/attn_processor.py b/src/attn_processor.py
index ff4ddd6..c950089 100644
--- a/src/attn_processor.py
+++ b/src/attn_processor.py
@@ -68,7 +68,8 @@ class PersonalizeAnythingAttnProcessor:
         ###################################################################################
         if timestep is not None:
             timestep = timestep
-            
+        else: #timestep is None
+            timestep = 0.0
         concept_process = self.concept_process # token concatenation
         c_q = concept_process and True # if token concatenation is applied to q
         c_kv = concept_process and True  # if token concatenation is applied to kv
@@ -442,4 +443,4 @@ class MultiPersonalizeAnythingAttnProcessor:
             hidden_states = hidden_states[:, :dims, :]
             ################################################################
             
-            return hidden_states
\ No newline at end of file
+            return hidden_states