diff --git a/embedchain/embedchain.py b/embedchain/embedchain.py
index fa153589..133e3e42 100644
--- a/embedchain/embedchain.py
+++ b/embedchain/embedchain.py
@@ -350,6 +350,10 @@ class EmbedChain(JSONSerializable):
 
         # get existing ids, and discard doc if any common id exist.
         where = {"url": src}
+        # if data type is qna_pair, we check for question
+        if chunker.data_type == DataType.QNA_PAIR:
+            where = {"question": src[0]}
+
         if self.config.id is not None:
             where["app_id"] = self.config.id