diff --git a/b/src/diffusers/schedulers/scheduling_ddpm.py b/b/src/diffusers/schedulers/scheduling_ddpm.py
new file mode 100644
index 000000000000..ab75ed76a822
--- /dev/null
+++ b/b/src/diffusers/schedulers/scheduling_ddpm.py
@@ -0,0 +1,10 @@
+            timesteps = np.array(timesteps, dtype=np.int64)
+            self.custom_timesteps = True
+        else:
+            if num_inference_steps <= 0:
+                raise ValueError(
+                    f"`num_inference_steps` must be a positive integer, but got {num_inference_steps}."
+                )
+            if num_inference_steps > self.config.num_train_timesteps:
+                raise ValueError(
+                    f"`num_inference_steps`: {num_inference_steps} cannot be larger than `self.config.train_timesteps`:"
diff --git a/src/diffusers/schedulers/scheduling_ddpm.py b/src/diffusers/schedulers/scheduling_ddpm.py
index 972c46c6e930..b2a335cd2e05 100644
--- a/src/diffusers/schedulers/scheduling_ddpm.py
+++ b/src/diffusers/schedulers/scheduling_ddpm.py
@@ -308,6 +308,10 @@ def set_timesteps(
             timesteps = np.array(timesteps, dtype=np.int64)
             self.custom_timesteps = True
         else:
+            if num_inference_steps <= 0:
+                raise ValueError(
+                    f"`num_inference_steps` must be a positive integer, but got {num_inference_steps}."
+                )
             if num_inference_steps > self.config.num_train_timesteps:
                 raise ValueError(
                     f"`num_inference_steps`: {num_inference_steps} cannot be larger than `self.config.train_timesteps`:"