Update crud_router.py

Author: LuisLuii

src/fastapi_quickcrud/crud_router.py

@@ -108,13 +108,18 @@ def get_transaction_session():
 
     if async_mode is None:
         async_mode = inspect.isasyncgen(db_session())
-    if async_mode:
+    
+    if sql_type is None:
         async def async_runner(f):
             return [i.bind.name async for i in f()]
-        if sql_type is None:
-            sql_type, = asyncio.get_event_loop().run_until_complete(async_runner(db_session))
-    elif sql_type is None:
-        sql_type, = [i.bind.name for i in db_session()]
+        try:
+            if async_mode:
+                sql_type, = asyncio.get_event_loop().run_until_complete(async_runner(db_session))
+            else:
+                sql_type, = [i.bind.name for i in db_session()]
+        except Exception:
+            raise RuntimeError("Some unknown problem occurred error, maybe you are uvicorn.run with reload=True. "
+                                "Try declaring sql_type for crud_router_builder yourself using from fastapi_quickcrud.misc.type import SqlType")
 
     if not crud_methods and NO_PRIMARY_KEY == False:
         crud_methods = CrudMethods.get_declarative_model_full_crud_method()