diff --git a/nerfstudio/engine/optimizers.py b/nerfstudio/engine/optimizers.py
index 3e147dcdc..b80b77bcb 100644
--- a/nerfstudio/engine/optimizers.py
+++ b/nerfstudio/engine/optimizers.py
@@ -108,7 +108,7 @@ class Optimizers:
         Args:
             param_group_name: name of scheduler to step forward
         """
-        if self.config.param_group_name.scheduler:  # type: ignore
+        if "scheduler" in self.config[param_group_name]:
             self.schedulers[param_group_name].step()
 
     def zero_grad_all(self) -> None: