diff --git a/embedchain/embedchain/vectordb/chroma.py b/embedchain/embedchain/vectordb/chroma.py
index e8d3e333..746dc149 100644
--- a/embedchain/embedchain/vectordb/chroma.py
+++ b/embedchain/embedchain/vectordb/chroma.py
@@ -212,7 +212,7 @@ class ChromaDB(BaseVectorDB):
         if where and raw_filter:
             raise ValueError("Both `where` and `raw_filter` cannot be used together.")
 
-        where_clause = {}
+        where_clause = None
         if raw_filter:
             where_clause = raw_filter
         if where: