diff --git a/chain_service/database/models/progress_chain.py b/chain_service/database/models/progress_chain.py
index 9eb0f0f..6128ac5 100644
--- a/chain_service/database/models/progress_chain.py
+++ b/chain_service/database/models/progress_chain.py
@@ -68,6 +68,9 @@ class ProgressChain(BaseMongoModel):
     ):
 
         for action in filter(lambda c: c.action_type == "comment", chain.actions):
+            if not action.text:
+                continue
+
             for key, value in variables.items():
                 action.text = action.text.replace(f"{{{{{key}}}}}", value)