diff --git a/modules/api/api.py b/modules/api/api.py
index 14613d8c..ce98cb8c 100644
--- a/modules/api/api.py
+++ b/modules/api/api.py
@@ -16,9 +16,11 @@ class TextToImageResponse(BaseModel):
 
 
 class Api:
-    def __init__(self, app):
+    def __init__(self, app, queue_lock):
         self.router = APIRouter()
-        app.add_api_route("/sdapi/v1/txt2img", self.text2imgapi, methods=["POST"])
+        self.app = app
+        self.queue_lock = queue_lock
+        self.app.add_api_route("/sdapi/v1/txt2img", self.text2imgapi, methods=["POST"])
 
     def text2imgapi(self, txt2imgreq: StableDiffusionProcessingAPI ):
         populate = txt2imgreq.copy(update={ # Override __init__ params
@@ -30,7 +32,8 @@ class Api:
         )
         p = StableDiffusionProcessingTxt2Img(**vars(populate))
         # Override object param
-        processed = process_images(p)
+        with self.queue_lock:
+            processed = process_images(p)
         
         b64images = []
         for i in processed.images:
@@ -52,5 +55,5 @@ class Api:
         raise NotImplementedError
 
     def launch(self, server_name, port):
-        app.include_router(self.router)
-        uvicorn.run(app, host=server_name, port=port)
+        self.app.include_router(self.router)
+        uvicorn.run(self.app, host=server_name, port=port)
diff --git a/webui.py b/webui.py
index 6212be01..71724c3b 100644
--- a/webui.py
+++ b/webui.py
@@ -4,7 +4,7 @@ import time
 import importlib
 import signal
 import threading
-
+from fastapi import FastAPI
 from fastapi.middleware.gzip import GZipMiddleware
 
 from modules.paths import script_path
@@ -31,7 +31,6 @@ from modules.paths import script_path
 from modules.shared import cmd_opts
 import modules.hypernetworks.hypernetwork
 
-
 queue_lock = threading.Lock()
 
 
@@ -97,7 +96,7 @@ def initialize():
 
 def create_api(app):
     from modules.api.api import Api
-    api = Api(app)
+    api = Api(app, queue_lock)
     return api
 
 def wait_on_server(demo=None):
@@ -141,7 +140,7 @@ def webui(launch_api=False):
             create_api(app)
 
         wait_on_server(demo)
-
+        
         sd_samplers.set_samplers()
 
         print('Reloading Custom Scripts')
@@ -153,11 +152,10 @@ def webui(launch_api=False):
         print('Restarting Gradio')
 
 
-if __name__ == "__main__":
-    if not cmd_opts.nowebui:
-        api_only()
 
-    if cmd_opts.api:
-        webui(True)
+task = []
+if __name__ == "__main__":
+    if cmd_opts.nowebui:
+        api_only()
     else:
-        webui(False)
+        webui(cmd_opts.api)
\ No newline at end of file