fix: prevent langfuse initialization (#4057)

src/backend/base/langflow/services/tracing/langfuse.py

@@ -30,22 +30,19 @@ class LangFuseTracer(BaseTracer):
         self.flow_id = trace_name.split(" - ")[-1]
         self.last_span: StatefulSpanClient | None = None
         self.spans: dict = {}
-        self._ready: bool = self.setup_langfuse()
+
+        config = self._get_config()
+        self._ready: bool = self.setup_langfuse(config) if config else False
 
     @property
     def ready(self):
         return self._ready
 
-    def setup_langfuse(self) -> bool:
+    def setup_langfuse(self, config) -> bool:
         try:
             from langfuse import Langfuse
             from langfuse.callback.langchain import LangchainCallbackHandler
 
-            config = self._get_config()
-            if not all(config.values()):
-                msg = "Missing Langfuse configuration"
-                raise ValueError(msg)
-
             self._client = Langfuse(**config)
             self.trace = self._client.trace(id=str(self.trace_id), name=self.flow_id)
 
@@ -134,8 +131,10 @@ class LangFuseTracer(BaseTracer):
             return None
         return None  # self._callback
 
-    def _get_config(self):
+    def _get_config(self) -> dict:
         secret_key = os.getenv("LANGFUSE_SECRET_KEY", None)
         public_key = os.getenv("LANGFUSE_PUBLIC_KEY", None)
         host = os.getenv("LANGFUSE_HOST", None)
-        return {"secret_key": secret_key, "public_key": public_key, "host": host}
+        if secret_key and public_key and host:
+            return {"secret_key": secret_key, "public_key": public_key, "host": host}
+        return {}