diff --git a/fbchat/graphql.py b/fbchat/graphql.py
index 510e93b9..e290e531 100644
--- a/fbchat/graphql.py
+++ b/fbchat/graphql.py
@@ -209,7 +209,13 @@ def graphql_to_message(message):
     rtn.timestamp = message.get('timestamp_precise')
     if message.get('unread') is not None:
         rtn.is_read = not message['unread']
-    rtn.reactions = {str(r['user']['id']):MessageReaction(r['reaction']) for r in message.get('message_reactions')}
+    rtn.reactions = {}
+    for r in message.get('message_reactions'):
+        try:
+            reaction = MessageReaction(r['reaction'])
+        except ValueError:
+            reaction = MessageReaction.UNDEFINED
+        rtn.reactions[str(r['user']['id'])] = reaction
     if message.get('blob_attachments') is not None:
         rtn.attachments = [graphql_to_attachment(attachment) for attachment in message['blob_attachments']]
     # TODO: This is still missing parsing:
diff --git a/fbchat/models.py b/fbchat/models.py
index 7cc9d65f..b9a13bcf 100644
--- a/fbchat/models.py
+++ b/fbchat/models.py
@@ -581,3 +581,4 @@ class MessageReaction(Enum):
     ANGRY = '😠'
     YES = '👍'
     NO = '👎'
+    UNDEFINED = ''