diff --git a/litellm/llms/vertex_ai.py b/litellm/llms/vertex_ai.py
index dc79e7e4e91..aabe084b8e4 100644
--- a/litellm/llms/vertex_ai.py
+++ b/litellm/llms/vertex_ai.py
@@ -647,9 +647,9 @@ def completion(
 
         prompt = " ".join(
             [
-                message["content"]
+                message.get("content")
                 for message in messages
-                if isinstance(message["content"], str)
+                if isinstance(message.get("content", None), str)
             ]
         )