From c4fdf78d03751be1e4e35079c1d139c86560156b Mon Sep 17 00:00:00 2001
From: Nuno Campos <nuno@langchain.dev>
Date: Thu, 2 Nov 2023 18:56:29 +0000
Subject: [PATCH] Fix AddableDict raising exception when used with non-addable
 values (#12785)

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---
 libs/langchain/langchain/schema/runnable/utils.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/libs/langchain/langchain/schema/runnable/utils.py b/libs/langchain/langchain/schema/runnable/utils.py
index 05ea6832d..781f52972 100644
--- a/libs/langchain/langchain/schema/runnable/utils.py
+++ b/libs/langchain/langchain/schema/runnable/utils.py
@@ -192,7 +192,11 @@ class AddableDict(Dict[str, Any]):
             if key not in chunk or chunk[key] is None:
                 chunk[key] = other[key]
             elif other[key] is not None:
-                chunk[key] = chunk[key] + other[key]
+                try:
+                    added = chunk[key] + other[key]
+                except TypeError:
+                    added = other[key]
+                chunk[key] = added
         return chunk
 
     def __radd__(self, other: AddableDict) -> AddableDict:
@@ -201,7 +205,11 @@ class AddableDict(Dict[str, Any]):
             if key not in chunk or chunk[key] is None:
                 chunk[key] = self[key]
             elif self[key] is not None:
-                chunk[key] = chunk[key] + self[key]
+                try:
+                    added = chunk[key] + self[key]
+                except TypeError:
+                    added = self[key]
+                chunk[key] = added
         return chunk